23100991 has 2 divisors, whose sum is σ = 23100992. Its totient is φ = 23100990.

The previous prime is 23100989. The next prime is 23101021. The reversal of 23100991 is 19900132.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 23100991 - 2¹ = 23100989 is a prime.

Together with 23100989, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23100911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11550495 + 11550496.

It is an arithmetic number, because the mean of its divisors is an integer number (11550496).

Almost surely, 2^23100991 is an apocalyptic number.

23100991 is a deficient number, since it is larger than the sum of its proper divisors (1).

23100991 is an equidigital number, since it uses as much as digits as its factorization.

23100991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 486, while the sum is 25.

The square root of 23100991 is about 4806.3490301891. The cubic root of 23100991 is about 284.8023293309.

The spelling of 23100991 in words is "twenty-three million, one hundred thousand, nine hundred ninety-one".