31042856 has 32 divisors (see below), whose sum is σ = 62920200. Its totient is φ = 14273280.

The previous prime is 31042853. The next prime is 31042871. The reversal of 31042856 is 65824013.

It can be written as a sum of positive squares in 4 ways, for example, as 5134756 + 25908100 = 2266^2 + 5090^2 .

It is a hoax number, since the sum of its digits (29) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (31042853) 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 7 ways as a sum of consecutive naturals, for example, 43430 + ... + 44138.

Almost surely, 2^31042856 is an apocalyptic number.

It is an amenable number.

31042856 is an abundant number, since it is smaller than the sum of its proper divisors (31877344).

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

31042856 is a wasteful number, since it uses less digits than its factorization.

31042856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1149 (or 1145 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 29.

The square root of 31042856 is about 5571.6116160407. The cubic root of 31042856 is about 314.2827588073.

Adding to 31042856 its reverse (65824013), we get a palindrome (96866869).

The spelling of 31042856 in words is "thirty-one million, forty-two thousand, eight hundred fifty-six".