225402165 has 24 divisors (see below), whose sum is σ = 391419288. Its totient is φ = 119992320.

The previous prime is 225402161. The next prime is 225402179. The reversal of 225402165 is 561204522.

It can be written as a sum of positive squares in 4 ways, for example, as 127035441 + 98366724 = 11271^2 + 9918^2 .

It is not a de Polignac number, because 225402165 - 2² = 225402161 is a prime.

It is a super-2 number, since 2×225402165² = 101612271973374450, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (225402161) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 21625 + ... + 30305.

It is an arithmetic number, because the mean of its divisors is an integer number (16309137).

Almost surely, 2^225402165 is an apocalyptic number.

It is an amenable number.

225402165 is a deficient number, since it is larger than the sum of its proper divisors (166017123).

225402165 is a wasteful number, since it uses less digits than its factorization.

225402165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9269 (or 9266 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 27.

The square root of 225402165 is about 15013.3995150998. The cubic root of 225402165 is about 608.5823614618.

Adding to 225402165 its reverse (561204522), we get a palindrome (786606687).

The spelling of 225402165 in words is "two hundred twenty-five million, four hundred two thousand, one hundred sixty-five".