225222781 has 8 divisors (see below), whose sum is σ = 265700864. Its totient is φ = 186820560.

The previous prime is 225222761. The next prime is 225222793. The reversal of 225222781 is 187222522.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 225222781 - 2⁷ = 225222653 is a prime.

It is a super-2 number, since 2×225222781² = 101450602162747922, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (225222761) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 518730 + ... + 519163.

It is an arithmetic number, because the mean of its divisors is an integer number (33212608).

Almost surely, 2^225222781 is an apocalyptic number.

It is an amenable number.

225222781 is a deficient number, since it is larger than the sum of its proper divisors (40478083).

225222781 is a wasteful number, since it uses less digits than its factorization.

225222781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1037931.

The product of its digits is 8960, while the sum is 31.

The square root of 225222781 is about 15007.4241960438. The cubic root of 225222781 is about 608.4208739391.

The spelling of 225222781 in words is "two hundred twenty-five million, two hundred twenty-two thousand, seven hundred eighty-one".