855931 has 6 divisors (see below), whose sum is σ = 903732. Its totient is φ = 810540.

The previous prime is 855923. The next prime is 855937. The reversal of 855931 is 139558.

It is not a de Polignac number, because 855931 - 2³ = 855923 is a prime.

It is a super-2 number, since 2×855931² = 1465235753522, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 855893 and 855902.

It is not an unprimeable number, because it can be changed into a prime (855937) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 825 + ... + 1546.

It is an arithmetic number, because the mean of its divisors is an integer number (150622).

2⁸⁵⁵⁹³¹ is an apocalyptic number.

855931 is a deficient number, since it is larger than the sum of its proper divisors (47801).

855931 is a wasteful number, since it uses less digits than its factorization.

855931 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2409 (or 2390 counting only the distinct ones).

The product of its digits is 5400, while the sum is 31.

The square root of 855931 is about 925.1653906194. The cubic root of 855931 is about 94.9466366971.

The spelling of 855931 in words is "eight hundred fifty-five thousand, nine hundred thirty-one".