23081681 has 4 divisors (see below), whose sum is σ = 26379072. Its totient is φ = 19784292.

The previous prime is 23081677. The next prime is 23081683. The reversal of 23081681 is 18618032.

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 23081681 - 2² = 23081677 is a prime.

It is a super-2 number, since 2×23081681² = 1065527995571522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (23081683) 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, 1648685 + ... + 1648698.

It is an arithmetic number, because the mean of its divisors is an integer number (6594768).

Almost surely, 2^23081681 is an apocalyptic number.

It is an amenable number.

23081681 is a deficient number, since it is larger than the sum of its proper divisors (3297391).

23081681 is an equidigital number, since it uses as much as digits as its factorization.

23081681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3297390.

The product of its (nonzero) digits is 2304, while the sum is 29.

The square root of 23081681 is about 4804.3398089644. The cubic root of 23081681 is about 284.7229522740.

The spelling of 23081681 in words is "twenty-three million, eighty-one thousand, six hundred eighty-one".