23215516 has 6 divisors (see below), whose sum is σ = 40627160. Its totient is φ = 11607756.

The previous prime is 23215513. The next prime is 23215529. The reversal of 23215516 is 61551232.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23215513) 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, 2901936 + ... + 2901943.

Almost surely, 2^23215516 is an apocalyptic number.

It is an amenable number.

23215516 is a deficient number, since it is larger than the sum of its proper divisors (17411644).

23215516 is a wasteful number, since it uses less digits than its factorization.

23215516 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5803883 (or 5803881 counting only the distinct ones).

The product of its digits is 1800, while the sum is 25.

The square root of 23215516 is about 4818.2482293879. The cubic root of 23215516 is about 285.2721971142.

Adding to 23215516 its reverse (61551232), we get a palindrome (84766748).

The spelling of 23215516 in words is "twenty-three million, two hundred fifteen thousand, five hundred sixteen".