225318981 has 16 divisors (see below), whose sum is σ = 307272960. Its totient is φ = 146827200.

The previous prime is 225318979. The next prime is 225318983. The reversal of 225318981 is 189813522.

It is an interprime number because it is at equal distance from previous prime (225318979) and next prime (225318983).

It is not a de Polignac number, because 225318981 - 2¹ = 225318979 is a prime.

It is a super-2 number, since 2×225318981² = 101537286397756722, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (225318983) 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 15 ways as a sum of consecutive naturals, for example, 19231 + ... + 28643.

It is an arithmetic number, because the mean of its divisors is an integer number (19204560).

Almost surely, 2^225318981 is an apocalyptic number.

It is an amenable number.

225318981 is a deficient number, since it is larger than the sum of its proper divisors (81953979).

225318981 is a wasteful number, since it uses less digits than its factorization.

225318981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9596.

The product of its digits is 34560, while the sum is 39.

The square root of 225318981 is about 15010.6289341919. The cubic root of 225318981 is about 608.5074870789.

The spelling of 225318981 in words is "two hundred twenty-five million, three hundred eighteen thousand, nine hundred eighty-one".