22725181 has 4 divisors (see below), whose sum is σ = 23154012. Its totient is φ = 22296352.

The previous prime is 22725169. The next prime is 22725187. The reversal of 22725181 is 18152722.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 6996025 + 15729156 = 2645^2 + 3966^2 .

It is a cyclic number.

It is not a de Polignac number, because 22725181 - 2²¹ = 20628029 is a prime.

It is a super-2 number, since 2×22725181² = 1032867702965522, 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 (22725187) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 214336 + ... + 214441.

It is an arithmetic number, because the mean of its divisors is an integer number (5788503).

Almost surely, 2^22725181 is an apocalyptic number.

It is an amenable number.

22725181 is a deficient number, since it is larger than the sum of its proper divisors (428831).

22725181 is an equidigital number, since it uses as much as digits as its factorization.

22725181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 428830.

The product of its digits is 2240, while the sum is 28.

The square root of 22725181 is about 4767.0935589728. The cubic root of 22725181 is about 283.2494772218.

The spelling of 22725181 in words is "twenty-two million, seven hundred twenty-five thousand, one hundred eighty-one".