23117891 has 4 divisors (see below), whose sum is σ = 23681784. Its totient is φ = 22554000.

The previous prime is 23117869. The next prime is 23117903. The reversal of 23117891 is 19871132.

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 23117891 - 2⁶ = 23117827 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (23117191) 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, 281885 + ... + 281966.

It is an arithmetic number, because the mean of its divisors is an integer number (5920446).

Almost surely, 2^23117891 is an apocalyptic number.

23117891 is a deficient number, since it is larger than the sum of its proper divisors (563893).

23117891 is an equidigital number, since it uses as much as digits as its factorization.

23117891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 563892.

The product of its digits is 3024, while the sum is 32.

The square root of 23117891 is about 4808.1067999786. The cubic root of 23117891 is about 284.8717633813.

The spelling of 23117891 in words is "twenty-three million, one hundred seventeen thousand, eight hundred ninety-one".