31025154761261 has 2 divisors, whose sum is σ = 31025154761262. Its totient is φ = 31025154761260.

The previous prime is 31025154761257. The next prime is 31025154761281. The reversal of 31025154761261 is 16216745152013.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 26608894541161 + 4416260220100 = 5158381^2 + 2101490^2 .

It is a cyclic number.

It is not a de Polignac number, because 31025154761261 - 2² = 31025154761257 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31025154761231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15512577380630 + 15512577380631.

It is an arithmetic number, because the mean of its divisors is an integer number (15512577380631).

Almost surely, 2^{31025154761261} is an apocalyptic number.

It is an amenable number.

31025154761261 is a deficient number, since it is larger than the sum of its proper divisors (1).

31025154761261 is an equidigital number, since it uses as much as digits as its factorization.

31025154761261 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 302400, while the sum is 44.

The spelling of 31025154761261 in words is "thirty-one trillion, twenty-five billion, one hundred fifty-four million, seven hundred sixty-one thousand, two hundred sixty-one".