23963981 has 2 divisors, whose sum is σ = 23963982. Its totient is φ = 23963980.

The previous prime is 23963963. The next prime is 23963987. The reversal of 23963981 is 18936932.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 23377225 + 586756 = 4835^2 + 766^2 .

It is a cyclic number.

It is not a de Polignac number, because 23963981 - 2⁶ = 23963917 is a prime.

It is a super-2 number, since 2×23963981² = 1148544770736722, 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 (23963987) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11981990 + 11981991.

It is an arithmetic number, because the mean of its divisors is an integer number (11981991).

Almost surely, 2^23963981 is an apocalyptic number.

It is an amenable number.

23963981 is a deficient number, since it is larger than the sum of its proper divisors (1).

23963981 is an equidigital number, since it uses as much as digits as its factorization.

23963981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 69984, while the sum is 41.

The square root of 23963981 is about 4895.3019314441. The cubic root of 23963981 is about 288.3055407369.

The spelling of 23963981 in words is "twenty-three million, nine hundred sixty-three thousand, nine hundred eighty-one".