23122991 has 2 divisors, whose sum is σ = 23122992. Its totient is φ = 23122990.

The previous prime is 23122961. The next prime is 23123029. The reversal of 23122991 is 19922132.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-23122991 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23122921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11561495 + 11561496.

It is an arithmetic number, because the mean of its divisors is an integer number (11561496).

Almost surely, 2^23122991 is an apocalyptic number.

23122991 is a deficient number, since it is larger than the sum of its proper divisors (1).

23122991 is an equidigital number, since it uses as much as digits as its factorization.

23122991 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1944, while the sum is 29.

The square root of 23122991 is about 4808.6371250075. The cubic root of 23122991 is about 284.8927102052.

The spelling of 23122991 in words is "twenty-three million, one hundred twenty-two thousand, nine hundred ninety-one".