631402265045261 has 2 divisors, whose sum is σ = 631402265045262. Its totient is φ = 631402265045260.

The previous prime is 631402265045207. The next prime is 631402265045273. The reversal of 631402265045261 is 162540562204136.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 441489225606025 + 189913039439236 = 21011645^2 + 13780894^2 .

It is a cyclic number.

It is not a de Polignac number, because 631402265045261 - 2²⁶ = 631402197936397 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (631402265015261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 315701132522630 + 315701132522631.

It is an arithmetic number, because the mean of its divisors is an integer number (315701132522631).

Almost surely, 2^{631402265045261} is an apocalyptic number.

It is an amenable number.

631402265045261 is a deficient number, since it is larger than the sum of its proper divisors (1).

631402265045261 is an equidigital number, since it uses as much as digits as its factorization.

631402265045261 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2073600, while the sum is 47.

The spelling of 631402265045261 in words is "six hundred thirty-one trillion, four hundred two billion, two hundred sixty-five million, forty-five thousand, two hundred sixty-one".