225415981 has 12 divisors (see below), whose sum is σ = 271893792. Its totient is φ = 183042504.

The previous prime is 225415961. The next prime is 225416003. The reversal of 225415981 is 189514522.

It is not a de Polignac number, because 225415981 - 2⁹ = 225415469 is a prime.

It is a super-2 number, since 2×225415981² = 101624728980384722, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 225415981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (225415961) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 42075 + ... + 47128.

It is an arithmetic number, because the mean of its divisors is an integer number (22657816).

Almost surely, 2^225415981 is an apocalyptic number.

It is an amenable number.

225415981 is a deficient number, since it is larger than the sum of its proper divisors (46477811).

225415981 is an equidigital number, since it uses as much as digits as its factorization.

225415981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89248 (or 89229 counting only the distinct ones).

The product of its digits is 28800, while the sum is 37.

The square root of 225415981 is about 15013.8596303549. The cubic root of 225415981 is about 608.5947955366.

The spelling of 225415981 in words is "two hundred twenty-five million, four hundred fifteen thousand, nine hundred eighty-one".