23112981 has 12 divisors (see below), whose sum is σ = 33433920. Its totient is φ = 15386280.

The previous prime is 23112977. The next prime is 23112983. The reversal of 23112981 is 18921132.

It is not a de Polignac number, because 23112981 - 2² = 23112977 is a prime.

It is a super-2 number, since 2×23112981² = 1068419781412722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23112983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6790 + ... + 9608.

It is an arithmetic number, because the mean of its divisors is an integer number (2786160).

Almost surely, 2^23112981 is an apocalyptic number.

It is an amenable number.

23112981 is a deficient number, since it is larger than the sum of its proper divisors (10320939).

23112981 is a wasteful number, since it uses less digits than its factorization.

23112981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3736 (or 3733 counting only the distinct ones).

The product of its digits is 864, while the sum is 27.

The square root of 23112981 is about 4807.5961768851. The cubic root of 23112981 is about 284.8515940185.

The spelling of 23112981 in words is "twenty-three million, one hundred twelve thousand, nine hundred eighty-one".