23312521 has 2 divisors, whose sum is σ = 23312522. Its totient is φ = 23312520.

The previous prime is 23312519. The next prime is 23312539. The reversal of 23312521 is 12521332.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21724921 + 1587600 = 4661^2 + 1260^2 .

It is a cyclic number.

It is not a de Polignac number, because 23312521 - 2¹ = 23312519 is a prime.

Together with 23312519, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (23312581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11656260 + 11656261.

It is an arithmetic number, because the mean of its divisors is an integer number (11656261).

Almost surely, 2^23312521 is an apocalyptic number.

It is an amenable number.

23312521 is a deficient number, since it is larger than the sum of its proper divisors (1).

23312521 is an equidigital number, since it uses as much as digits as its factorization.

23312521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 360, while the sum is 19.

The square root of 23312521 is about 4828.3041536341. The cubic root of 23312521 is about 285.6689773749.

Adding to 23312521 its reverse (12521332), we get a palindrome (35833853).

The spelling of 23312521 in words is "twenty-three million, three hundred twelve thousand, five hundred twenty-one".