23491431 has 16 divisors (see below), whose sum is σ = 34878720. Its totient is φ = 15626520.

The previous prime is 23491409. The next prime is 23491451. The reversal of 23491431 is 13419432.

It is not a de Polignac number, because 23491431 - 2⁶ = 23491367 is a prime.

It is a super-2 number, since 2×23491431² = 1103694660855522, which contains 22 as substring.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 23491395 and 23491404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23491451) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19476 + ... + 20646.

It is an arithmetic number, because the mean of its divisors is an integer number (2179920).

Almost surely, 2^23491431 is an apocalyptic number.

23491431 is a deficient number, since it is larger than the sum of its proper divisors (11387289).

23491431 is a wasteful number, since it uses less digits than its factorization.

23491431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1923 (or 1917 counting only the distinct ones).

The product of its digits is 2592, while the sum is 27.

The square root of 23491431 is about 4846.7959519666. The cubic root of 23491431 is about 286.3978967873.

The spelling of 23491431 in words is "twenty-three million, four hundred ninety-one thousand, four hundred thirty-one".