23931643 has 2 divisors, whose sum is σ = 23931644. Its totient is φ = 23931642.

The previous prime is 23931623. The next prime is 23931683. The reversal of 23931643 is 34613932.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-23931643 is a prime.

It is not a weakly prime, because it can be changed into another prime (23931623) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11965821 + 11965822.

It is an arithmetic number, because the mean of its divisors is an integer number (11965822).

Almost surely, 2^23931643 is an apocalyptic number.

23931643 is a deficient number, since it is larger than the sum of its proper divisors (1).

23931643 is an equidigital number, since it uses as much as digits as its factorization.

23931643 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11664, while the sum is 31.

The square root of 23931643 is about 4891.9978536381. The cubic root of 23931643 is about 288.1757985008.

The spelling of 23931643 in words is "twenty-three million, nine hundred thirty-one thousand, six hundred forty-three".