23181500159 has 4 divisors (see below), whose sum is σ = 23214196920. Its totient is φ = 23148803400.

The previous prime is 23181500143. The next prime is 23181500171. The reversal of 23181500159 is 95100518132.

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 23181500159 - 2⁴ = 23181500143 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 (23181500759) 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, 16347317 + ... + 16348734.

It is an arithmetic number, because the mean of its divisors is an integer number (5803549230).

Almost surely, 2^23181500159 is an apocalyptic number.

23181500159 is a deficient number, since it is larger than the sum of its proper divisors (32696761).

23181500159 is an equidigital number, since it uses as much as digits as its factorization.

23181500159 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32696760.

The product of its (nonzero) digits is 10800, while the sum is 35.

The spelling of 23181500159 in words is "twenty-three billion, one hundred eighty-one million, five hundred thousand, one hundred fifty-nine".