23031331 has 4 divisors (see below), whose sum is σ = 23290200. Its totient is φ = 22772464.

The previous prime is 23031329. The next prime is 23031367. The reversal of 23031331 is 13313032.

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 23031331 - 2¹ = 23031329 is a prime.

It is a super-2 number, since 2×23031331² = 1060884415263122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (23031301) 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, 129301 + ... + 129478.

It is an arithmetic number, because the mean of its divisors is an integer number (5822550).

Almost surely, 2^23031331 is an apocalyptic number.

23031331 is a deficient number, since it is larger than the sum of its proper divisors (258869).

23031331 is an equidigital number, since it uses as much as digits as its factorization.

23031331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 258868.

The product of its (nonzero) digits is 162, while the sum is 16.

The square root of 23031331 is about 4799.0968942083. The cubic root of 23031331 is about 284.5157715627.

Adding to 23031331 its reverse (13313032), we get a palindrome (36344363).

The spelling of 23031331 in words is "twenty-three million, thirty-one thousand, three hundred thirty-one".