23401555591 has 2 divisors, whose sum is σ = 23401555592. Its totient is φ = 23401555590.

The previous prime is 23401555549. The next prime is 23401555601. The reversal of 23401555591 is 19555510432.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 23401555591 - 2¹¹ = 23401553543 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23401555391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11700777795 + 11700777796.

It is an arithmetic number, because the mean of its divisors is an integer number (11700777796).

Almost surely, 2^23401555591 is an apocalyptic number.

23401555591 is a deficient number, since it is larger than the sum of its proper divisors (1).

23401555591 is an equidigital number, since it uses as much as digits as its factorization.

23401555591 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 135000, while the sum is 40.

The spelling of 23401555591 in words is "twenty-three billion, four hundred one million, five hundred fifty-five thousand, five hundred ninety-one".