31541408021 has 2 divisors, whose sum is σ = 31541408022. Its totient is φ = 31541408020.

The previous prime is 31541408009. The next prime is 31541408051. The reversal of 31541408021 is 12080414513.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 31007335921 + 534072100 = 176089^2 + 23110^2 .

It is a cyclic number.

It is not a de Polignac number, because 31541408021 - 2¹⁸ = 31541145877 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31541408051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15770704010 + 15770704011.

It is an arithmetic number, because the mean of its divisors is an integer number (15770704011).

Almost surely, 2^31541408021 is an apocalyptic number.

It is an amenable number.

31541408021 is a deficient number, since it is larger than the sum of its proper divisors (1).

31541408021 is an equidigital number, since it uses as much as digits as its factorization.

31541408021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3840, while the sum is 29.

The spelling of 31541408021 in words is "thirty-one billion, five hundred forty-one million, four hundred eight thousand, twenty-one".