23551989 has 4 divisors (see below), whose sum is σ = 31402656. Its totient is φ = 15701324.

The previous prime is 23551967. The next prime is 23551991. The reversal of 23551989 is 98915532.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 23551989 - 2⁸ = 23551733 is a prime.

It is a super-2 number, since 2×23551989² = 1109392371712242, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 23551989.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23551949) 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, 3925329 + ... + 3925334.

It is an arithmetic number, because the mean of its divisors is an integer number (7850664).

Almost surely, 2^23551989 is an apocalyptic number.

It is an amenable number.

23551989 is a deficient number, since it is larger than the sum of its proper divisors (7850667).

23551989 is an equidigital number, since it uses as much as digits as its factorization.

23551989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7850666.

The product of its digits is 97200, while the sum is 42.

The square root of 23551989 is about 4853.0391508827. The cubic root of 23551989 is about 286.6437850554.

The spelling of 23551989 in words is "twenty-three million, five hundred fifty-one thousand, nine hundred eighty-nine".