23981723981 has 8 divisors (see below), whose sum is σ = 25302499200. Its totient is φ = 22666806720.

The previous prime is 23981723959. The next prime is 23981724001. The reversal of 23981723981 is 18932718932.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 23981723981 - 2¹⁰ = 23981722957 is a prime.

It is a super-2 number, since 2×23981723981² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23981723581) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1456076 + ... + 1472453.

It is an arithmetic number, because the mean of its divisors is an integer number (3162812400).

Almost surely, 2^23981723981 is an apocalyptic number.

It is an amenable number.

23981723981 is a deficient number, since it is larger than the sum of its proper divisors (1320775219).

23981723981 is a wasteful number, since it uses less digits than its factorization.

23981723981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2928979.

The product of its digits is 1306368, while the sum is 53.

The spelling of 23981723981 in words is "twenty-three billion, nine hundred eighty-one million, seven hundred twenty-three thousand, nine hundred eighty-one".