31254077521 has 2 divisors, whose sum is σ = 31254077522. Its totient is φ = 31254077520.

The previous prime is 31254077501. The next prime is 31254077527. The reversal of 31254077521 is 12577045213.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 30029077521 + 1225000000 = 173289^2 + 35000^2 .

It is a cyclic number.

It is not a de Polignac number, because 31254077521 - 2⁹ = 31254077009 is a prime.

It is not a weakly prime, because it can be changed into another prime (31254077527) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15627038760 + 15627038761.

It is an arithmetic number, because the mean of its divisors is an integer number (15627038761).

Almost surely, 2^31254077521 is an apocalyptic number.

It is an amenable number.

31254077521 is a deficient number, since it is larger than the sum of its proper divisors (1).

31254077521 is an equidigital number, since it uses as much as digits as its factorization.

31254077521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 58800, while the sum is 37.

The spelling of 31254077521 in words is "thirty-one billion, two hundred fifty-four million, seventy-seven thousand, five hundred twenty-one".