31117057 has 2 divisors, whose sum is σ = 31117058. Its totient is φ = 31117056.

The previous prime is 31117049. The next prime is 31117061. The reversal of 31117057 is 75071113.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 31091776 + 25281 = 5576^2 + 159^2 .

It is a cyclic number.

It is not a de Polignac number, because 31117057 - 2³ = 31117049 is a prime.

It is not a weakly prime, because it can be changed into another prime (31117007) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15558528 + 15558529.

It is an arithmetic number, because the mean of its divisors is an integer number (15558529).

Almost surely, 2^31117057 is an apocalyptic number.

It is an amenable number.

31117057 is a deficient number, since it is larger than the sum of its proper divisors (1).

31117057 is an equidigital number, since it uses as much as digits as its factorization.

31117057 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 735, while the sum is 25.

The square root of 31117057 is about 5578.2664870011. The cubic root of 31117057 is about 314.5329670907.

The spelling of 31117057 in words is "thirty-one million, one hundred seventeen thousand, fifty-seven".