23981961 has 4 divisors (see below), whose sum is σ = 31975952. Its totient is φ = 15987972.

The previous prime is 23981959. The next prime is 23981981. The reversal of 23981961 is 16918932.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 23981961 - 2¹ = 23981959 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (23981921) 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, 3996991 + ... + 3996996.

It is an arithmetic number, because the mean of its divisors is an integer number (7993988).

Almost surely, 2^23981961 is an apocalyptic number.

It is an amenable number.

23981961 is a deficient number, since it is larger than the sum of its proper divisors (7993991).

23981961 is an equidigital number, since it uses as much as digits as its factorization.

23981961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7993990.

The product of its digits is 23328, while the sum is 39.

The square root of 23981961 is about 4897.1380417546. The cubic root of 23981961 is about 288.3776272254.

It can be divided in two parts, 23981 and 961, that added together give a palindrome (24942).

The spelling of 23981961 in words is "twenty-three million, nine hundred eighty-one thousand, nine hundred sixty-one".