23415991 has 4 divisors (see below), whose sum is σ = 23736832. Its totient is φ = 23095152.

The previous prime is 23415971. The next prime is 23416007. The reversal of 23415991 is 19951432.

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 23415991 - 2²¹ = 21318839 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 (23415901) 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, 160311 + ... + 160456.

It is an arithmetic number, because the mean of its divisors is an integer number (5934208).

Almost surely, 2^23415991 is an apocalyptic number.

23415991 is a deficient number, since it is larger than the sum of its proper divisors (320841).

23415991 is an equidigital number, since it uses as much as digits as its factorization.

23415991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 320840.

The product of its digits is 9720, while the sum is 34.

The square root of 23415991 is about 4839.0072328940. The cubic root of 23415991 is about 286.0909901694.

The spelling of 23415991 in words is "twenty-three million, four hundred fifteen thousand, nine hundred ninety-one".