23117491 has 4 divisors (see below), whose sum is σ = 23132632. Its totient is φ = 23102352.

The previous prime is 23117477. The next prime is 23117513. The reversal of 23117491 is 19471132.

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 23117491 - 2⁵ = 23117459 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (23117401) 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, 4986 + ... + 8431.

It is an arithmetic number, because the mean of its divisors is an integer number (5783158).

Almost surely, 2^23117491 is an apocalyptic number.

23117491 is a deficient number, since it is larger than the sum of its proper divisors (15141).

23117491 is a wasteful number, since it uses less digits than its factorization.

23117491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15140.

The product of its digits is 1512, while the sum is 28.

The square root of 23117491 is about 4808.0652033848. The cubic root of 23117491 is about 284.8701203629.

The spelling of 23117491 in words is "twenty-three million, one hundred seventeen thousand, four hundred ninety-one".