22538181 has 4 divisors (see below), whose sum is σ = 30050912. Its totient is φ = 15025452.

The previous prime is 22538119. The next prime is 22538203. The reversal of 22538181 is 18183522.

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 22538181 - 2⁷ = 22538053 is a prime.

It is a super-2 number, since 2×22538181² = 1015939205577522, 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 (22538111) 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, 3756361 + ... + 3756366.

It is an arithmetic number, because the mean of its divisors is an integer number (7512728).

Almost surely, 2^22538181 is an apocalyptic number.

It is an amenable number.

22538181 is a deficient number, since it is larger than the sum of its proper divisors (7512731).

22538181 is an equidigital number, since it uses as much as digits as its factorization.

22538181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7512730.

The product of its digits is 3840, while the sum is 30.

The square root of 22538181 is about 4747.4394150953. The cubic root of 22538181 is about 282.4704059635.

It can be divided in two parts, 22 and 538181, that added together give a triangular number (538203 = T₁₀₃₇).

The spelling of 22538181 in words is "twenty-two million, five hundred thirty-eight thousand, one hundred eighty-one".