1399660831631 has 2 divisors, whose sum is σ = 1399660831632. Its totient is φ = 1399660831630.

The previous prime is 1399660831609. The next prime is 1399660831669. The reversal of 1399660831631 is 1361380669931.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1399660831631 - 2⁶ = 1399660831567 is a prime.

It is a super-2 number, since 2×1399660831631² (a number of 25 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1399660831601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 699830415815 + 699830415816.

It is an arithmetic number, because the mean of its divisors is an integer number (699830415816).

Almost surely, 2^{1399660831631} is an apocalyptic number.

1399660831631 is a deficient number, since it is larger than the sum of its proper divisors (1).

1399660831631 is an equidigital number, since it uses as much as digits as its factorization.

1399660831631 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3779136, while the sum is 56.

The spelling of 1399660831631 in words is "one trillion, three hundred ninety-nine billion, six hundred sixty million, eight hundred thirty-one thousand, six hundred thirty-one".