31646744761 has 2 divisors, whose sum is σ = 31646744762. Its totient is φ = 31646744760.

The previous prime is 31646744693. The next prime is 31646744783. The reversal of 31646744761 is 16744764613.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 31637381161 + 9363600 = 177869^2 + 3060^2 .

It is a cyclic number.

It is not a de Polignac number, because 31646744761 - 2⁹ = 31646744249 is a prime.

It is not a weakly prime, because it can be changed into another prime (31646744861) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15823372380 + 15823372381.

It is an arithmetic number, because the mean of its divisors is an integer number (15823372381).

Almost surely, 2^31646744761 is an apocalyptic number.

It is an amenable number.

31646744761 is a deficient number, since it is larger than the sum of its proper divisors (1).

31646744761 is an equidigital number, since it uses as much as digits as its factorization.

31646744761 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2032128, while the sum is 49.

The spelling of 31646744761 in words is "thirty-one billion, six hundred forty-six million, seven hundred forty-four thousand, seven hundred sixty-one".