1311626535631 has 2 divisors, whose sum is σ = 1311626535632. Its totient is φ = 1311626535630.

The previous prime is 1311626535623. The next prime is 1311626535647. The reversal of 1311626535631 is 1365356261131.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1311626535631 - 2³ = 1311626535623 is a prime.

It is a super-2 number, since 2×1311626535631² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1311626535601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 655813267815 + 655813267816.

It is an arithmetic number, because the mean of its divisors is an integer number (655813267816).

Almost surely, 2^{1311626535631} is an apocalyptic number.

1311626535631 is a deficient number, since it is larger than the sum of its proper divisors (1).

1311626535631 is an equidigital number, since it uses as much as digits as its factorization.

1311626535631 is an evil number, because the sum of its binary digits is even.

The product of its digits is 291600, while the sum is 43.

The spelling of 1311626535631 in words is "one trillion, three hundred eleven billion, six hundred twenty-six million, five hundred thirty-five thousand, six hundred thirty-one".