31647675893 has 2 divisors, whose sum is σ = 31647675894. Its totient is φ = 31647675892.

The previous prime is 31647675833. The next prime is 31647675931. The reversal of 31647675893 is 39857674613.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 23340811729 + 8306864164 = 152777^2 + 91142^2 .

It is a cyclic number.

It is not a de Polignac number, because 31647675893 - 2⁸ = 31647675637 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31647675833) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15823837946 + 15823837947.

It is an arithmetic number, because the mean of its divisors is an integer number (15823837947).

Almost surely, 2^31647675893 is an apocalyptic number.

It is an amenable number.

31647675893 is a deficient number, since it is larger than the sum of its proper divisors (1).

31647675893 is an equidigital number, since it uses as much as digits as its factorization.

31647675893 is an evil number, because the sum of its binary digits is even.

The product of its digits is 22861440, while the sum is 59.

The spelling of 31647675893 in words is "thirty-one billion, six hundred forty-seven million, six hundred seventy-five thousand, eight hundred ninety-three".