23153781 has 16 divisors (see below), whose sum is σ = 35399168. Its totient is φ = 13186800.

The previous prime is 23153771. The next prime is 23153789. The reversal of 23153781 is 18735132.

It is not a de Polignac number, because 23153781 - 2⁷ = 23153653 is a prime.

It is a super-2 number, since 2×23153781² = 1072195149191922, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23153789) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5286 + ... + 8616.

It is an arithmetic number, because the mean of its divisors is an integer number (2212448).

Almost surely, 2^23153781 is an apocalyptic number.

23153781 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

23153781 is a deficient number, since it is larger than the sum of its proper divisors (12245387).

23153781 is a wasteful number, since it uses less digits than its factorization.

23153781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3672.

The product of its digits is 5040, while the sum is 30.

The square root of 23153781 is about 4811.8375907755. The cubic root of 23153781 is about 285.0191061368.

The spelling of 23153781 in words is "twenty-three million, one hundred fifty-three thousand, seven hundred eighty-one".