31262650621 has 2 divisors, whose sum is σ = 31262650622. Its totient is φ = 31262650620.

The previous prime is 31262650619. The next prime is 31262650691. The reversal of 31262650621 is 12605626213.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 30279828121 + 982822500 = 174011^2 + 31350^2 .

It is a cyclic number.

It is not a de Polignac number, because 31262650621 - 2¹ = 31262650619 is a prime.

Together with 31262650619, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31262650691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15631325310 + 15631325311.

It is an arithmetic number, because the mean of its divisors is an integer number (15631325311).

Almost surely, 2^31262650621 is an apocalyptic number.

It is an amenable number.

31262650621 is a deficient number, since it is larger than the sum of its proper divisors (1).

31262650621 is an equidigital number, since it uses as much as digits as its factorization.

31262650621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 25920, while the sum is 34.

The spelling of 31262650621 in words is "thirty-one billion, two hundred sixty-two million, six hundred fifty thousand, six hundred twenty-one".