23318431 has 2 divisors, whose sum is σ = 23318432. Its totient is φ = 23318430.

The previous prime is 23318429. The next prime is 23318443. The reversal of 23318431 is 13481332.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 23318431 - 2¹ = 23318429 is a prime.

It is a super-2 number, since 2×23318431² = 1087498448603522, which contains 22 as substring.

Together with 23318429, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 23318396 and 23318405.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23318731) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11659215 + 11659216.

It is an arithmetic number, because the mean of its divisors is an integer number (11659216).

Almost surely, 2^23318431 is an apocalyptic number.

23318431 is a deficient number, since it is larger than the sum of its proper divisors (1).

23318431 is an equidigital number, since it uses as much as digits as its factorization.

23318431 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1728, while the sum is 25.

The square root of 23318431 is about 4828.9161309760. The cubic root of 23318431 is about 285.6931154909.

Adding to 23318431 its reverse (13481332), we get a palindrome (36799763).

The spelling of 23318431 in words is "twenty-three million, three hundred eighteen thousand, four hundred thirty-one".