31631124661 has 2 divisors, whose sum is σ = 31631124662. Its totient is φ = 31631124660.

The previous prime is 31631124653. The next prime is 31631124743. The reversal of 31631124661 is 16642113613.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21664896100 + 9966228561 = 147190^2 + 99831^2 .

It is a cyclic number.

It is not a de Polignac number, because 31631124661 - 2³ = 31631124653 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31631124061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15815562330 + 15815562331.

It is an arithmetic number, because the mean of its divisors is an integer number (15815562331).

Almost surely, 2^31631124661 is an apocalyptic number.

It is an amenable number.

31631124661 is a deficient number, since it is larger than the sum of its proper divisors (1).

31631124661 is an equidigital number, since it uses as much as digits as its factorization.

31631124661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15552, while the sum is 34.

The spelling of 31631124661 in words is "thirty-one billion, six hundred thirty-one million, one hundred twenty-four thousand, six hundred sixty-one".