23215315 has 4 divisors (see below), whose sum is σ = 27858384. Its totient is φ = 18572248.

The previous prime is 23215279. The next prime is 23215327. The reversal of 23215315 is 51351232.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-23215315 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2321527 + ... + 2321536.

It is an arithmetic number, because the mean of its divisors is an integer number (6964596).

Almost surely, 2^23215315 is an apocalyptic number.

23215315 is a deficient number, since it is larger than the sum of its proper divisors (4643069).

23215315 is an equidigital number, since it uses as much as digits as its factorization.

23215315 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4643068.

The product of its digits is 900, while the sum is 22.

The square root of 23215315 is about 4818.2273711397. The cubic root of 23215315 is about 285.2713738160.

Adding to 23215315 its reverse (51351232), we get a palindrome (74566547).

The spelling of 23215315 in words is "twenty-three million, two hundred fifteen thousand, three hundred fifteen".