23561431 has 2 divisors, whose sum is σ = 23561432. Its totient is φ = 23561430.

The previous prime is 23561423. The next prime is 23561437. The reversal of 23561431 is 13416532.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 23561431 - 2³ = 23561423 is a prime.

It is a super-2 number, since 2×23561431² = 1110282061535522, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 23561396 and 23561405.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23561437) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11780715 + 11780716.

It is an arithmetic number, because the mean of its divisors is an integer number (11780716).

Almost surely, 2^23561431 is an apocalyptic number.

23561431 is a deficient number, since it is larger than the sum of its proper divisors (1).

23561431 is an equidigital number, since it uses as much as digits as its factorization.

23561431 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2160, while the sum is 25.

The square root of 23561431 is about 4854.0118458858. The cubic root of 23561431 is about 286.6820851331.

Adding to 23561431 its reverse (13416532), we get a palindrome (36977963).

The spelling of 23561431 in words is "twenty-three million, five hundred sixty-one thousand, four hundred thirty-one".