1231590643 has 2 divisors, whose sum is σ = 1231590644. Its totient is φ = 1231590642.

The previous prime is 1231590631. The next prime is 1231590713. The reversal of 1231590643 is 3460951321.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1231590643 - 2²⁵ = 1198036211 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1231590599 and 1231590608.

It is not a weakly prime, because it can be changed into another prime (1231590043) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 615795321 + 615795322.

It is an arithmetic number, because the mean of its divisors is an integer number (615795322).

Almost surely, 2^1231590643 is an apocalyptic number.

1231590643 is a deficient number, since it is larger than the sum of its proper divisors (1).

1231590643 is an equidigital number, since it uses as much as digits as its factorization.

1231590643 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 19440, while the sum is 34.

The square root of 1231590643 is about 35094.0257451322. The cubic root of 1231590643 is about 1071.9029353876.

The spelling of 1231590643 in words is "one billion, two hundred thirty-one million, five hundred ninety thousand, six hundred forty-three".