23911997 has 4 divisors (see below), whose sum is σ = 24025536. Its totient is φ = 23798460.

The previous prime is 23911991. The next prime is 23912003. The reversal of 23911997 is 79911932.

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 an interprime number because it is at equal distance from previous prime (23911991) and next prime (23912003).

It is a cyclic number.

It is not a de Polignac number, because 23911997 - 2⁴ = 23911981 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 (23911991) 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, 56453 + ... + 56874.

It is an arithmetic number, because the mean of its divisors is an integer number (6006384).

Almost surely, 2^23911997 is an apocalyptic number.

It is an amenable number.

23911997 is a deficient number, since it is larger than the sum of its proper divisors (113539).

23911997 is a wasteful number, since it uses less digits than its factorization.

23911997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113538.

The product of its digits is 30618, while the sum is 41.

The square root of 23911997 is about 4889.9894682913. The cubic root of 23911997 is about 288.0969203441.

The spelling of 23911997 in words is "twenty-three million, nine hundred eleven thousand, nine hundred ninety-seven".