23661431 has 2 divisors, whose sum is σ = 23661432. Its totient is φ = 23661430.

The previous prime is 23661359. The next prime is 23661487. The reversal of 23661431 is 13416632.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 23661431 - 2¹⁰ = 23660407 is a prime.

It is a super-2 number, since 2×23661431² = 1119726633935522, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 23661431.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23661031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11830715 + 11830716.

It is an arithmetic number, because the mean of its divisors is an integer number (11830716).

Almost surely, 2^23661431 is an apocalyptic number.

23661431 is a deficient number, since it is larger than the sum of its proper divisors (1).

23661431 is an equidigital number, since it uses as much as digits as its factorization.

23661431 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2592, while the sum is 26.

The square root of 23661431 is about 4864.3016970579. The cubic root of 23661431 is about 287.0870937221.

The spelling of 23661431 in words is "twenty-three million, six hundred sixty-one thousand, four hundred thirty-one".