225215331 has 32 divisors (see below), whose sum is σ = 336061440. Its totient is φ = 133005600.

The previous prime is 225215327. The next prime is 225215339. The reversal of 225215331 is 133512522.

It is a happy number.

225215331 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 225215331 - 2² = 225215327 is a prime.

It is a super-2 number, since 2×225215331² = 101443890634879122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (225215339) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 254616 + ... + 255498.

It is an arithmetic number, because the mean of its divisors is an integer number (10501920).

Almost surely, 2^225215331 is an apocalyptic number.

225215331 is a deficient number, since it is larger than the sum of its proper divisors (110846109).

225215331 is a wasteful number, since it uses less digits than its factorization.

225215331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1087.

The product of its digits is 1800, while the sum is 24.

The square root of 225215331 is about 15007.1759835087. The cubic root of 225215331 is about 608.4141653437.

Adding to 225215331 its reverse (133512522), we get a palindrome (358727853).

The spelling of 225215331 in words is "two hundred twenty-five million, two hundred fifteen thousand, three hundred thirty-one".