23215331 has 4 divisors (see below), whose sum is σ = 23224992. Its totient is φ = 23205672.

The previous prime is 23215327. The next prime is 23215351. The reversal of 23215331 is 13351232.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 23215331 - 2² = 23215327 is a prime.

It is a super-2 number, since 2×23215331² = 1077903186879122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (23215351) 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 in 3 ways as a sum of consecutive naturals, for example, 1910 + ... + 7076.

It is an arithmetic number, because the mean of its divisors is an integer number (5806248).

Almost surely, 2^23215331 is an apocalyptic number.

23215331 is a deficient number, since it is larger than the sum of its proper divisors (9661).

23215331 is an equidigital number, since it uses as much as digits as its factorization.

23215331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9660.

The product of its digits is 540, while the sum is 20.

The square root of 23215331 is about 4818.2290315011. The cubic root of 23215331 is about 285.2714393523.

Adding to 23215331 its reverse (13351232), we get a palindrome (36566563).

The spelling of 23215331 in words is "twenty-three million, two hundred fifteen thousand, three hundred thirty-one".