23312515 has 4 divisors (see below), whose sum is σ = 27975024. Its totient is φ = 18650008.

The previous prime is 23312489. The next prime is 23312519. The reversal of 23312515 is 51521332.

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 23312515 - 2⁵ = 23312483 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (23312519) 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, 2331247 + ... + 2331256.

It is an arithmetic number, because the mean of its divisors is an integer number (6993756).

Almost surely, 2^23312515 is an apocalyptic number.

23312515 is a deficient number, since it is larger than the sum of its proper divisors (4662509).

23312515 is an equidigital number, since it uses as much as digits as its factorization.

23312515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4662508.

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

The square root of 23312515 is about 4828.3035322979. The cubic root of 23312515 is about 285.6689528672.

Adding to 23312515 its reverse (51521332), we get a palindrome (74833847).

The spelling of 23312515 in words is "twenty-three million, three hundred twelve thousand, five hundred fifteen".