23120924581 has 4 divisors (see below), whose sum is σ = 23151468172. Its totient is φ = 23090380992.

The previous prime is 23120924539. The next prime is 23120924669. The reversal of 23120924581 is 18542902132.

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

It can be written as a sum of positive squares in 2 ways, for example, as 6507003556 + 16613921025 = 80666^2 + 128895^2 .

It is a cyclic number.

It is not a de Polignac number, because 23120924581 - 2¹⁵ = 23120891813 is a prime.

It is a super-2 number, since 2×23120924581² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 23120924581.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23120924881) 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, 15270660 + ... + 15272173.

It is an arithmetic number, because the mean of its divisors is an integer number (5787867043).

Almost surely, 2^23120924581 is an apocalyptic number.

It is an amenable number.

23120924581 is a deficient number, since it is larger than the sum of its proper divisors (30543591).

23120924581 is an equidigital number, since it uses as much as digits as its factorization.

23120924581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30543590.

The product of its (nonzero) digits is 34560, while the sum is 37.

The spelling of 23120924581 in words is "twenty-three billion, one hundred twenty million, nine hundred twenty-four thousand, five hundred eighty-one".