23055781 has 4 divisors (see below), whose sum is σ = 26349472. Its totient is φ = 19762092.

The previous prime is 23055761. The next prime is 23055793. The reversal of 23055781 is 18755032.

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 23055781 - 2⁵ = 23055749 is a prime.

It is a super-2 number, since 2×23055781² = 1063138075039922, which 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 (23055731) 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, 1646835 + ... + 1646848.

It is an arithmetic number, because the mean of its divisors is an integer number (6587368).

Almost surely, 2^23055781 is an apocalyptic number.

It is an amenable number.

23055781 is a deficient number, since it is larger than the sum of its proper divisors (3293691).

23055781 is an equidigital number, since it uses as much as digits as its factorization.

23055781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3293690.

The product of its (nonzero) digits is 8400, while the sum is 31.

The square root of 23055781 is about 4801.6435727780. The cubic root of 23055781 is about 284.6164163529.

The spelling of 23055781 in words is "twenty-three million, fifty-five thousand, seven hundred eighty-one".