23991751691 has 2 divisors, whose sum is σ = 23991751692. Its totient is φ = 23991751690.

The previous prime is 23991751669. The next prime is 23991751703. The reversal of 23991751691 is 19615719932.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-23991751691 is a prime.

It is not a weakly prime, because it can be changed into another prime (23991751621) 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, 11995875845 + 11995875846.

It is an arithmetic number, because the mean of its divisors is an integer number (11995875846).

Almost surely, 2^23991751691 is an apocalyptic number.

23991751691 is a deficient number, since it is larger than the sum of its proper divisors (1).

23991751691 is an equidigital number, since it uses as much as digits as its factorization.

23991751691 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 918540, while the sum is 53.

The spelling of 23991751691 in words is "twenty-three billion, nine hundred ninety-one million, seven hundred fifty-one thousand, six hundred ninety-one".