EN
We obtain estimates for the average value of the largest prime factor P(n) in short intervals [x,x+y] and of h(P(n)+1), where h is a complex-valued additive function or multiplicative function satisfying certain conditions. Letting $s_{q}(n)$ stand for the sum of the digits of n in base q ≥ 2, we show that if α is an irrational number, then the sequence $(αs_{q}(P(n)))_{n∈ ℕ}$ is uniformly distributed modulo 1.