23231431 has 4 divisors (see below), whose sum is σ = 23980864. Its totient is φ = 22482000.

The previous prime is 23231399. The next prime is 23231473. The reversal of 23231431 is 13413232.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 23231431 - 2⁵ = 23231399 is a prime.

It is a super-2 number, since 2×23231431² = 1079398772615522, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 23231399 and 23231408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23231491) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 374670 + ... + 374731.

It is an arithmetic number, because the mean of its divisors is an integer number (5995216).

Almost surely, 2^23231431 is an apocalyptic number.

23231431 is a deficient number, since it is larger than the sum of its proper divisors (749433).

23231431 is an equidigital number, since it uses as much as digits as its factorization.

23231431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 749432.

The product of its digits is 432, while the sum is 19.

The square root of 23231431 is about 4819.8994802796. The cubic root of 23231431 is about 285.3373700492.

Adding to 23231431 its reverse (13413232), we get a palindrome (36644663).

The spelling of 23231431 in words is "twenty-three million, two hundred thirty-one thousand, four hundred thirty-one".