31087057 has 2 divisors, whose sum is σ = 31087058. Its totient is φ = 31087056.

The previous prime is 31087051. The next prime is 31087087. The reversal of 31087057 is 75078013.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 28987456 + 2099601 = 5384^2 + 1449^2 .

It is a cyclic number.

It is not a de Polignac number, because 31087057 - 2⁷ = 31086929 is a prime.

It is a super-2 number, since 2×31087057² = 1932810225842498, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (31087051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15543528 + 15543529.

It is an arithmetic number, because the mean of its divisors is an integer number (15543529).

Almost surely, 2^31087057 is an apocalyptic number.

It is an amenable number.

31087057 is a deficient number, since it is larger than the sum of its proper divisors (1).

31087057 is an equidigital number, since it uses as much as digits as its factorization.

31087057 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5880, while the sum is 31.

The square root of 31087057 is about 5575.5768311449. The cubic root of 31087057 is about 314.4318540253.

The spelling of 31087057 in words is "thirty-one million, eighty-seven thousand, fifty-seven".