23011987 has 2 divisors, whose sum is σ = 23011988. Its totient is φ = 23011986.

The previous prime is 23011979. The next prime is 23011991. The reversal of 23011987 is 78911032.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 23011987 - 2³ = 23011979 is a prime.

It is not a weakly prime, because it can be changed into another prime (23011957) 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, 11505993 + 11505994.

It is an arithmetic number, because the mean of its divisors is an integer number (11505994).

Almost surely, 2^23011987 is an apocalyptic number.

23011987 is a deficient number, since it is larger than the sum of its proper divisors (1).

23011987 is an equidigital number, since it uses as much as digits as its factorization.

23011987 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3024, while the sum is 31.

The square root of 23011987 is about 4797.0810916640. The cubic root of 23011987 is about 284.4360943808.

The spelling of 23011987 in words is "twenty-three million, eleven thousand, nine hundred eighty-seven".