225145331 has 16 divisors (see below), whose sum is σ = 244228608. Its totient is φ = 206774400.

The previous prime is 225145313. The next prime is 225145387. The reversal of 225145331 is 133541522.

It is a happy number.

It is not a de Polignac number, because 225145331 - 2¹⁰ = 225144307 is a prime.

It is a super-2 number, since 2×225145331² = 101380840142199122, 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 225145331.

It is not an unprimeable number, because it can be changed into a prime (225145831) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 123416 + ... + 125226.

It is an arithmetic number, because the mean of its divisors is an integer number (15264288).

Almost surely, 2^225145331 is an apocalyptic number.

225145331 is a deficient number, since it is larger than the sum of its proper divisors (19083277).

225145331 is a wasteful number, since it uses less digits than its factorization.

225145331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2002.

The product of its digits is 3600, while the sum is 26.

The square root of 225145331 is about 15004.8435846563. The cubic root of 225145331 is about 608.3511243353.

Adding to 225145331 its reverse (133541522), we get a palindrome (358686853).

The spelling of 225145331 in words is "two hundred twenty-five million, one hundred forty-five thousand, three hundred thirty-one".