31242856 has 8 divisors (see below), whose sum is σ = 58580370. Its totient is φ = 15621424.

The previous prime is 31242851. The next prime is 31242863. The reversal of 31242856 is 65824213.

It can be written as a sum of positive squares in only one way, i.e., 24304900 + 6937956 = 4930^2 + 2634^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×31242856² = 1952232102073472, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (31242851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1952671 + ... + 1952686.

Almost surely, 2^31242856 is an apocalyptic number.

It is an amenable number.

31242856 is a deficient number, since it is larger than the sum of its proper divisors (27337514).

31242856 is a wasteful number, since it uses less digits than its factorization.

31242856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3905363 (or 3905359 counting only the distinct ones).

The product of its digits is 11520, while the sum is 31.

The square root of 31242856 is about 5589.5309284411. The cubic root of 31242856 is about 314.9562583085.

The spelling of 31242856 in words is "thirty-one million, two hundred forty-two thousand, eight hundred fifty-six".