23481681 has 4 divisors (see below), whose sum is σ = 31308912. Its totient is φ = 15654452.

The previous prime is 23481649. The next prime is 23481721. The reversal of 23481681 is 18618432.

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 a cyclic number.

It is not a de Polignac number, because 23481681 - 2⁵ = 23481649 is a prime.

It is a super-2 number, since 2×23481681² = 1102778685171522, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (23481611) 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, 3913611 + ... + 3913616.

It is an arithmetic number, because the mean of its divisors is an integer number (7827228).

Almost surely, 2^23481681 is an apocalyptic number.

It is an amenable number.

23481681 is a deficient number, since it is larger than the sum of its proper divisors (7827231).

23481681 is an equidigital number, since it uses as much as digits as its factorization.

23481681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7827230.

The product of its digits is 9216, while the sum is 33.

The square root of 23481681 is about 4845.7900284680. The cubic root of 23481681 is about 286.3582686366.

The spelling of 23481681 in words is "twenty-three million, four hundred eighty-one thousand, six hundred eighty-one".