23215513 has 2 divisors, whose sum is σ = 23215514. Its totient is φ = 23215512.

The previous prime is 23215501. The next prime is 23215529. The reversal of 23215513 is 31551232.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 23011209 + 204304 = 4797^2 + 452^2 .

It is a cyclic number.

It is not a de Polignac number, because 23215513 - 2⁵ = 23215481 is a prime.

It is not a weakly prime, because it can be changed into another prime (23615513) by changing a digit.

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 as a sum of consecutive naturals, namely, 11607756 + 11607757.

It is an arithmetic number, because the mean of its divisors is an integer number (11607757).

Almost surely, 2^23215513 is an apocalyptic number.

It is an amenable number.

23215513 is a deficient number, since it is larger than the sum of its proper divisors (1).

23215513 is an equidigital number, since it uses as much as digits as its factorization.

23215513 is an odious number, because the sum of its binary digits is odd.

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

The square root of 23215513 is about 4818.2479180715. The cubic root of 23215513 is about 285.2721848262.

Adding to 23215513 its reverse (31551232), we get a palindrome (54766745).

The spelling of 23215513 in words is "twenty-three million, two hundred fifteen thousand, five hundred thirteen".