23971864591 has 2 divisors, whose sum is σ = 23971864592. Its totient is φ = 23971864590.

The previous prime is 23971864573. The next prime is 23971864597. The reversal of 23971864591 is 19546817932.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 23971864591 - 2²³ = 23963475983 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23971864597) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11985932295 + 11985932296.

It is an arithmetic number, because the mean of its divisors is an integer number (11985932296).

Almost surely, 2^23971864591 is an apocalyptic number.

23971864591 is a deficient number, since it is larger than the sum of its proper divisors (1).

23971864591 is an equidigital number, since it uses as much as digits as its factorization.

23971864591 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3265920, while the sum is 55.

The spelling of 23971864591 in words is "twenty-three billion, nine hundred seventy-one million, eight hundred sixty-four thousand, five hundred ninety-one".