31655628761 has 2 divisors, whose sum is σ = 31655628762. Its totient is φ = 31655628760.

The previous prime is 31655628733. The next prime is 31655628841. The reversal of 31655628761 is 16782655613.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 24118090000 + 7537538761 = 155300^2 + 86819^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31655628761 is a prime.

It is not a weakly prime, because it can be changed into another prime (31655628731) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15827814380 + 15827814381.

It is an arithmetic number, because the mean of its divisors is an integer number (15827814381).

Almost surely, 2^31655628761 is an apocalyptic number.

It is an amenable number.

31655628761 is a deficient number, since it is larger than the sum of its proper divisors (1).

31655628761 is an equidigital number, since it uses as much as digits as its factorization.

31655628761 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1814400, while the sum is 50.

The spelling of 31655628761 in words is "thirty-one billion, six hundred fifty-five million, six hundred twenty-eight thousand, seven hundred sixty-one".