23029991 has 2 divisors, whose sum is σ = 23029992. Its totient is φ = 23029990.

The previous prime is 23029949. The next prime is 23029997. The reversal of 23029991 is 19992032.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-23029991 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23029997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11514995 + 11514996.

It is an arithmetic number, because the mean of its divisors is an integer number (11514996).

Almost surely, 2^23029991 is an apocalyptic number.

23029991 is a deficient number, since it is larger than the sum of its proper divisors (1).

23029991 is an equidigital number, since it uses as much as digits as its factorization.

23029991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8748, while the sum is 35.

The square root of 23029991 is about 4798.9572825771. The cubic root of 23029991 is about 284.5102535935.

The spelling of 23029991 in words is "twenty-three million, twenty-nine thousand, nine hundred ninety-one".