23968981 has 2 divisors, whose sum is σ = 23968982. Its totient is φ = 23968980.

The previous prime is 23968979. The next prime is 23968999. The reversal of 23968981 is 18986932.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18404100 + 5564881 = 4290^2 + 2359^2 .

It is a cyclic number.

It is not a de Polignac number, because 23968981 - 2¹ = 23968979 is a prime.

It is a super-2 number, since 2×23968981² = 1149024100356722, which contains 22 as substring.

Together with 23968979, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23968951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11984490 + 11984491.

It is an arithmetic number, because the mean of its divisors is an integer number (11984491).

Almost surely, 2^23968981 is an apocalyptic number.

It is an amenable number.

23968981 is a deficient number, since it is larger than the sum of its proper divisors (1).

23968981 is an equidigital number, since it uses as much as digits as its factorization.

23968981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 186624, while the sum is 46.

The square root of 23968981 is about 4895.8125985377. The cubic root of 23968981 is about 288.3255906534.

The spelling of 23968981 in words is "twenty-three million, nine hundred sixty-eight thousand, nine hundred eighty-one".