31495967513 has 2 divisors, whose sum is σ = 31495967514. Its totient is φ = 31495967512.

The previous prime is 31495967497. The next prime is 31495967527. The reversal of 31495967513 is 31576959413.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 28524845449 + 2971122064 = 168893^2 + 54508^2 .

It is a cyclic number.

It is not a de Polignac number, because 31495967513 - 2⁴ = 31495967497 is a prime.

It is not a weakly prime, because it can be changed into another prime (31495967593) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15747983756 + 15747983757.

It is an arithmetic number, because the mean of its divisors is an integer number (15747983757).

Almost surely, 2^31495967513 is an apocalyptic number.

It is an amenable number.

31495967513 is a deficient number, since it is larger than the sum of its proper divisors (1).

31495967513 is an equidigital number, since it uses as much as digits as its factorization.

31495967513 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3061800, while the sum is 53.

The spelling of 31495967513 in words is "thirty-one billion, four hundred ninety-five million, nine hundred sixty-seven thousand, five hundred thirteen".