31061917 has 2 divisors, whose sum is σ = 31061918. Its totient is φ = 31061916.

The previous prime is 31061911. The next prime is 31061963. The reversal of 31061917 is 71916013.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 30404196 + 657721 = 5514^2 + 811^2 .

It is a cyclic number.

It is not a de Polignac number, because 31061917 - 2³ = 31061909 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31061911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15530958 + 15530959.

It is an arithmetic number, because the mean of its divisors is an integer number (15530959).

Almost surely, 2^31061917 is an apocalyptic number.

It is an amenable number.

31061917 is a deficient number, since it is larger than the sum of its proper divisors (1).

31061917 is an equidigital number, since it uses as much as digits as its factorization.

31061917 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1134, while the sum is 28.

The square root of 31061917 is about 5573.3218999085. The cubic root of 31061917 is about 314.3470711671.

The spelling of 31061917 in words is "thirty-one million, sixty-one thousand, nine hundred seventeen".