23127991 has 2 divisors, whose sum is σ = 23127992. Its totient is φ = 23127990.

The previous prime is 23127983. The next prime is 23128009. The reversal of 23127991 is 19972132.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 23127991 - 2³ = 23127983 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23127911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11563995 + 11563996.

It is an arithmetic number, because the mean of its divisors is an integer number (11563996).

Almost surely, 2^23127991 is an apocalyptic number.

23127991 is a deficient number, since it is larger than the sum of its proper divisors (1).

23127991 is an equidigital number, since it uses as much as digits as its factorization.

23127991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6804, while the sum is 34.

The square root of 23127991 is about 4809.1569947341. The cubic root of 23127991 is about 284.9132433171.

The spelling of 23127991 in words is "twenty-three million, one hundred twenty-seven thousand, nine hundred ninety-one".