1231541686313 has 2 divisors, whose sum is σ = 1231541686314. Its totient is φ = 1231541686312.

The previous prime is 1231541686279. The next prime is 1231541686321. The reversal of 1231541686313 is 3136861451321.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 936766529689 + 294775156624 = 967867^2 + 542932^2 .

It is a cyclic number.

It is not a de Polignac number, because 1231541686313 - 2⁸ = 1231541686057 is a prime.

It is not a weakly prime, because it can be changed into another prime (1231541686373) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 615770843156 + 615770843157.

It is an arithmetic number, because the mean of its divisors is an integer number (615770843157).

Almost surely, 2^{1231541686313} is an apocalyptic number.

It is an amenable number.

1231541686313 is a deficient number, since it is larger than the sum of its proper divisors (1).

1231541686313 is an equidigital number, since it uses as much as digits as its factorization.

1231541686313 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 311040, while the sum is 44.

The spelling of 1231541686313 in words is "one trillion, two hundred thirty-one billion, five hundred forty-one million, six hundred eighty-six thousand, three hundred thirteen".