856549155 has 48 divisors (see below), whose sum is σ = 1739176704. Its totient is φ = 355965120.

The previous prime is 856549147. The next prime is 856549157. The reversal of 856549155 is 551945658.

It is not a de Polignac number, because 856549155 - 2³ = 856549147 is a prime.

It is not an unprimeable number, because it can be changed into a prime (856549157) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 44887 + ... + 61056.

It is an arithmetic number, because the mean of its divisors is an integer number (36232848).

Almost surely, 2^856549155 is an apocalyptic number.

856549155 is an abundant number, since it is smaller than the sum of its proper divisors (882627549).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

856549155 is a wasteful number, since it uses less digits than its factorization.

856549155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105976 (or 105969 counting only the distinct ones).

The product of its digits is 1080000, while the sum is 48.

The square root of 856549155 is about 29266.8610376993. The cubic root of 856549155 is about 949.6948807756.

The spelling of 856549155 in words is "eight hundred fifty-six million, five hundred forty-nine thousand, one hundred fifty-five".