23271991 has 2 divisors, whose sum is σ = 23271992. Its totient is φ = 23271990.

The previous prime is 23271977. The next prime is 23272009. The reversal of 23271991 is 19917232.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 23271991 - 2⁵ = 23271959 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23271961) 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, 11635995 + 11635996.

It is an arithmetic number, because the mean of its divisors is an integer number (11635996).

Almost surely, 2^23271991 is an apocalyptic number.

23271991 is a deficient number, since it is larger than the sum of its proper divisors (1).

23271991 is an equidigital number, since it uses as much as digits as its factorization.

23271991 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 23271991 is about 4824.1052020038. The cubic root of 23271991 is about 285.5033313417.

The spelling of 23271991 in words is "twenty-three million, two hundred seventy-one thousand, nine hundred ninety-one".