31013641261 has 2 divisors, whose sum is σ = 31013641262. Its totient is φ = 31013641260.

The previous prime is 31013641199. The next prime is 31013641291. The reversal of 31013641261 is 16214631013.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 23288286025 + 7725355236 = 152605^2 + 87894^2 .

It is a cyclic number.

It is not a de Polignac number, because 31013641261 - 2⁷ = 31013641133 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31013641291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15506820630 + 15506820631.

It is an arithmetic number, because the mean of its divisors is an integer number (15506820631).

Almost surely, 2^31013641261 is an apocalyptic number.

It is an amenable number.

31013641261 is a deficient number, since it is larger than the sum of its proper divisors (1).

31013641261 is an equidigital number, since it uses as much as digits as its factorization.

31013641261 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2592, while the sum is 28.

The spelling of 31013641261 in words is "thirty-one billion, thirteen million, six hundred forty-one thousand, two hundred sixty-one".