23866981 has 2 divisors, whose sum is σ = 23866982. Its totient is φ = 23866980.

The previous prime is 23866957. The next prime is 23866991. The reversal of 23866981 is 18966832.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16892100 + 6974881 = 4110^2 + 2641^2 .

It is a cyclic number.

It is not a de Polignac number, because 23866981 - 2⁷ = 23866853 is a prime.

It is a super-2 number, since 2×23866981² = 1139265564108722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23866951) 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 as a sum of consecutive naturals, namely, 11933490 + 11933491.

It is an arithmetic number, because the mean of its divisors is an integer number (11933491).

Almost surely, 2^23866981 is an apocalyptic number.

It is an amenable number.

23866981 is a deficient number, since it is larger than the sum of its proper divisors (1).

23866981 is an equidigital number, since it uses as much as digits as its factorization.

23866981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 124416, while the sum is 43.

The square root of 23866981 is about 4885.3844270436. The cubic root of 23866981 is about 287.9160192700.

The spelling of 23866981 in words is "twenty-three million, eight hundred sixty-six thousand, nine hundred eighty-one".