31751968 has 12 divisors (see below), whose sum is σ = 62511750. Its totient is φ = 15875968.

The previous prime is 31751959. The next prime is 31751969. The reversal of 31751968 is 86915713.

It can be written as a sum of positive squares in only one way, i.e., 23155344 + 8596624 = 4812^2 + 2932^2 .

It is a super-3 number, since 3×31751968³ (a number of 23 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 31751968.

It is not an unprimeable number, because it can be changed into a prime (31751969) 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 as a sum of consecutive naturals, namely, 496093 + ... + 496156.

Almost surely, 2^31751968 is an apocalyptic number.

It is an amenable number.

31751968 is a deficient number, since it is larger than the sum of its proper divisors (30759782).

31751968 is an equidigital number, since it uses as much as digits as its factorization.

31751968 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 992259 (or 992251 counting only the distinct ones).

The product of its digits is 45360, while the sum is 40.

The square root of 31751968 is about 5634.8884638474. Note that the first 3 decimals coincide. The cubic root of 31751968 is about 316.6578188971.

The spelling of 31751968 in words is "thirty-one million, seven hundred fifty-one thousand, nine hundred sixty-eight".