23420431172591 has 4 divisors (see below), whose sum is σ = 24175928952384. Its totient is φ = 22664933392800.

The previous prime is 23420431172587. The next prime is 23420431172599. The reversal of 23420431172591 is 19527113402432.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 23420431172591 - 2² = 23420431172587 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23420431172599) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 377748889850 + ... + 377748889911.

It is an arithmetic number, because the mean of its divisors is an integer number (6043982238096).

Almost surely, 2^{23420431172591} is an apocalyptic number.

23420431172591 is a deficient number, since it is larger than the sum of its proper divisors (755497779793).

23420431172591 is an equidigital number, since it uses as much as digits as its factorization.

23420431172591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 755497779792.

The product of its (nonzero) digits is 362880, while the sum is 44.

The spelling of 23420431172591 in words is "twenty-three trillion, four hundred twenty billion, four hundred thirty-one million, one hundred seventy-two thousand, five hundred ninety-one".