23751989 has 2 divisors, whose sum is σ = 23751990. Its totient is φ = 23751988.

The previous prime is 23751977. The next prime is 23751991. The reversal of 23751989 is 98915732.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14691889 + 9060100 = 3833^2 + 3010^2 .

It is a cyclic number.

It is not a de Polignac number, because 23751989 - 2⁸ = 23751733 is a prime.

It is a super-2 number, since 2×23751989² = 1128313962912242, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 23751991, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23751929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11875994 + 11875995.

It is an arithmetic number, because the mean of its divisors is an integer number (11875995).

Almost surely, 2^23751989 is an apocalyptic number.

It is an amenable number.

23751989 is a deficient number, since it is larger than the sum of its proper divisors (1).

23751989 is an equidigital number, since it uses as much as digits as its factorization.

23751989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 136080, while the sum is 44.

The square root of 23751989 is about 4873.6012352264. The cubic root of 23751989 is about 287.4528779733.

The spelling of 23751989 in words is "twenty-three million, seven hundred fifty-one thousand, nine hundred eighty-nine".