23451 has 4 divisors (see below), whose sum is σ = 31272. Its totient is φ = 15632.

The previous prime is 23447. The next prime is 23459. The reversal of 23451 is 15432.

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 23451 - 2² = 23447 is a prime.

It is a D-number.

23451 is a lucky number.

It is a plaindrome in base 11.

It is a self number, because there is not a number n which added to its sum of digits gives 23451.

It is not an unprimeable number, because it can be changed into a prime (23459) 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, 3906 + ... + 3911.

It is an arithmetic number, because the mean of its divisors is an integer number (7818).

2²³⁴⁵¹ is an apocalyptic number.

23451 is a deficient number, since it is larger than the sum of its proper divisors (7821).

23451 is an equidigital number, since it uses as much as digits as its factorization.

23451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7820.

The product of its digits is 120, while the sum is 15.

The square root of 23451 is about 153.1371933921. The cubic root of 23451 is about 28.6233496376.

Subtracting from 23451 its sum of digits (15), we obtain a triangular number (23436 = T₂₁₆).

Adding to 23451 its reverse (15432), we get a palindrome (38883).

It can be divided in two parts, 2345 and 1, that added together give a triangular number (2346 = T₆₈).

The spelling of 23451 in words is "twenty-three thousand, four hundred fifty-one".