31958081 has 2 divisors, whose sum is σ = 31958082. Its totient is φ = 31958080.

The previous prime is 31958039. The next prime is 31958089. The reversal of 31958081 is 18085913.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 27615025 + 4343056 = 5255^2 + 2084^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31958081 is a prime.

It is a super-2 number, since 2×31958081² = 2042637882405122, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (31958089) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15979040 + 15979041.

It is an arithmetic number, because the mean of its divisors is an integer number (15979041).

Almost surely, 2^31958081 is an apocalyptic number.

It is an amenable number.

31958081 is a deficient number, since it is larger than the sum of its proper divisors (1).

31958081 is an equidigital number, since it uses as much as digits as its factorization.

31958081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8640, while the sum is 35.

The square root of 31958081 is about 5653.1478841438. The cubic root of 31958081 is about 317.3415200979.

The spelling of 31958081 in words is "thirty-one million, nine hundred fifty-eight thousand, eighty-one".