23386981 has 2 divisors, whose sum is σ = 23386982. Its totient is φ = 23386980.

The previous prime is 23386907. The next prime is 23386999. The reversal of 23386981 is 18968332.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 23328900 + 58081 = 4830^2 + 241^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-23386981 is a prime.

It is a super-2 number, since 2×23386981² = 1093901760588722, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23386901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11693490 + 11693491.

It is an arithmetic number, because the mean of its divisors is an integer number (11693491).

Almost surely, 2^23386981 is an apocalyptic number.

It is an amenable number.

23386981 is a deficient number, since it is larger than the sum of its proper divisors (1).

23386981 is an equidigital number, since it uses as much as digits as its factorization.

23386981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 62208, while the sum is 40.

The square root of 23386981 is about 4836.0087882468. The cubic root of 23386981 is about 285.9727955932.

The spelling of 23386981 in words is "twenty-three million, three hundred eighty-six thousand, nine hundred eighty-one".