225681181 has 4 divisors (see below), whose sum is σ = 246197664. Its totient is φ = 205164700.

The previous prime is 225681173. The next prime is 225681187. The reversal of 225681181 is 181186522.

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 225681181 - 2³ = 225681173 is a prime.

It is a super-2 number, since 2×225681181² = 101863990915109522, 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 (225681187) 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, 10258225 + ... + 10258246.

It is an arithmetic number, because the mean of its divisors is an integer number (61549416).

Almost surely, 2^225681181 is an apocalyptic number.

It is an amenable number.

225681181 is a deficient number, since it is larger than the sum of its proper divisors (20516483).

225681181 is a wasteful number, since it uses less digits than its factorization.

225681181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20516482.

The product of its digits is 7680, while the sum is 34.

The square root of 225681181 is about 15022.6888738335. The cubic root of 225681181 is about 608.8333708813.

The spelling of 225681181 in words is "two hundred twenty-five million, six hundred eighty-one thousand, one hundred eighty-one".