31119521 has 2 divisors, whose sum is σ = 31119522. Its totient is φ = 31119520.

The previous prime is 31119463. The next prime is 31119527. The reversal of 31119521 is 12591113.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16974400 + 14145121 = 4120^2 + 3761^2 .

It is a cyclic number.

It is not a de Polignac number, because 31119521 - 2⁶ = 31119457 is a prime.

It is not a weakly prime, because it can be changed into another prime (31119527) 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, 15559760 + 15559761.

It is an arithmetic number, because the mean of its divisors is an integer number (15559761).

Almost surely, 2^31119521 is an apocalyptic number.

It is an amenable number.

31119521 is a deficient number, since it is larger than the sum of its proper divisors (1).

31119521 is an equidigital number, since it uses as much as digits as its factorization.

31119521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 270, while the sum is 23.

The square root of 31119521 is about 5578.4873397723. The cubic root of 31119521 is about 314.5412689552.

The spelling of 31119521 in words is "thirty-one million, one hundred nineteen thousand, five hundred twenty-one".