23181313 has 4 divisors (see below), whose sum is σ = 23224240. Its totient is φ = 23138388.

The previous prime is 23181289. The next prime is 23181317. The reversal of 23181313 is 31318132.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-23181313 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (23181317) 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, 20643 + ... + 21736.

It is an arithmetic number, because the mean of its divisors is an integer number (5806060).

Almost surely, 2^23181313 is an apocalyptic number.

It is an amenable number.

23181313 is a deficient number, since it is larger than the sum of its proper divisors (42927).

23181313 is an equidigital number, since it uses as much as digits as its factorization.

23181313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42926.

The product of its digits is 432, while the sum is 22.

The square root of 23181313 is about 4814.6976021345. The cubic root of 23181313 is about 285.1320328010.

Adding to 23181313 its reverse (31318132), we get a palindrome (54499445).

The spelling of 23181313 in words is "twenty-three million, one hundred eighty-one thousand, three hundred thirteen".