23215491 has 24 divisors (see below), whose sum is σ = 37455600. Its totient is φ = 14284512.

The previous prime is 23215481. The next prime is 23215501. The reversal of 23215491 is 19451232.

It is an interprime number because it is at equal distance from previous prime (23215481) and next prime (23215501).

It is not a de Polignac number, because 23215491 - 2⁵ = 23215459 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (23215481) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 516 + ... + 6833.

It is an arithmetic number, because the mean of its divisors is an integer number (1560650).

Almost surely, 2^23215491 is an apocalyptic number.

23215491 is a deficient number, since it is larger than the sum of its proper divisors (14240109).

23215491 is an equidigital number, since it uses as much as digits as its factorization.

23215491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7377 (or 7365 counting only the distinct ones).

The product of its digits is 2160, while the sum is 27.

The square root of 23215491 is about 4818.2456350834. The cubic root of 23215491 is about 285.2720947142.

The spelling of 23215491 in words is "twenty-three million, two hundred fifteen thousand, four hundred ninety-one".