31304457491 has 2 divisors, whose sum is σ = 31304457492. Its totient is φ = 31304457490.

The previous prime is 31304457467. The next prime is 31304457511. The reversal of 31304457491 is 19475440313.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 31304457491 - 2²⁶ = 31237348627 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (31304457991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15652228745 + 15652228746.

It is an arithmetic number, because the mean of its divisors is an integer number (15652228746).

Almost surely, 2^31304457491 is an apocalyptic number.

31304457491 is a deficient number, since it is larger than the sum of its proper divisors (1).

31304457491 is an equidigital number, since it uses as much as digits as its factorization.

31304457491 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 181440, while the sum is 41.

The spelling of 31304457491 in words is "thirty-one billion, three hundred four million, four hundred fifty-seven thousand, four hundred ninety-one".