1231365431 has 2 divisors, whose sum is σ = 1231365432. Its totient is φ = 1231365430.

The previous prime is 1231365427. The next prime is 1231365449. The reversal of 1231365431 is 1345631321.

It is a weak prime.

It is an emirp because it is prime and its reverse (1345631321) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1231365431 - 2² = 1231365427 is a prime.

It is a super-2 number, since 2×1231365431² = 3032521649323631522, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1231365394 and 1231365403.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1231365451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 615682715 + 615682716.

It is an arithmetic number, because the mean of its divisors is an integer number (615682716).

Almost surely, 2^1231365431 is an apocalyptic number.

1231365431 is a deficient number, since it is larger than the sum of its proper divisors (1).

1231365431 is an equidigital number, since it uses as much as digits as its factorization.

1231365431 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6480, while the sum is 29.

The square root of 1231365431 is about 35090.8169041417. The cubic root of 1231365431 is about 1071.8375943801.

Adding to 1231365431 its reverse (1345631321), we get a palindrome (2576996752).

The spelling of 1231365431 in words is "one billion, two hundred thirty-one million, three hundred sixty-five thousand, four hundred thirty-one".