23951 has 4 divisors (see below), whose sum is σ = 24552. Its totient is φ = 23352.

The previous prime is 23929. The next prime is 23957. The reversal of 23951 is 15932.

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 23951 - 2⁶ = 23887 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23957) 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, 236 + ... + 321.

It is an arithmetic number, because the mean of its divisors is an integer number (6138).

2²³⁹⁵¹ is an apocalyptic number.

23951 is a deficient number, since it is larger than the sum of its proper divisors (601).

23951 is an equidigital number, since it uses as much as digits as its factorization.

23951 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 600.

The product of its digits is 270, while the sum is 20.

The square root of 23951 is about 154.7611062250. The cubic root of 23951 is about 28.8253474121.

The spelling of 23951 in words is "twenty-three thousand, nine hundred fifty-one".