31975244513 has 2 divisors, whose sum is σ = 31975244514. Its totient is φ = 31975244512.

The previous prime is 31975244467. The next prime is 31975244611. The reversal of 31975244513 is 31544257913.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 31959427984 + 15816529 = 178772^2 + 3977^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31975244513 is a prime.

It is a super-2 number, since 2×31975244513² (a number of 22 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (31975244813) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15987622256 + 15987622257.

It is an arithmetic number, because the mean of its divisors is an integer number (15987622257).

Almost surely, 2^31975244513 is an apocalyptic number.

It is an amenable number.

31975244513 is a deficient number, since it is larger than the sum of its proper divisors (1).

31975244513 is an equidigital number, since it uses as much as digits as its factorization.

31975244513 is an evil number, because the sum of its binary digits is even.

The product of its digits is 453600, while the sum is 44.

The spelling of 31975244513 in words is "thirty-one billion, nine hundred seventy-five million, two hundred forty-four thousand, five hundred thirteen".