225521465 has 16 divisors (see below), whose sum is σ = 292969488. Its totient is φ = 165666816.

The previous prime is 225521449. The next prime is 225521467. The reversal of 225521465 is 564125522.

It can be written as a sum of positive squares in 8 ways, for example, as 34058896 + 191462569 = 5836^2 + 13837^2 .

It is a cyclic number.

It is not a de Polignac number, because 225521465 - 2⁴ = 225521449 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (225521467) 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, 3557 + ... + 21533.

It is an arithmetic number, because the mean of its divisors is an integer number (18310593).

Almost surely, 2^225521465 is an apocalyptic number.

It is an amenable number.

225521465 is a deficient number, since it is larger than the sum of its proper divisors (67448023).

225521465 is a wasteful number, since it uses less digits than its factorization.

225521465 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18188.

The product of its digits is 24000, while the sum is 32.

The square root of 225521465 is about 15017.3721069966. The cubic root of 225521465 is about 608.6897119100.

Adding to 225521465 its reverse (564125522), we get a palindrome (789646987).

The spelling of 225521465 in words is "two hundred twenty-five million, five hundred twenty-one thousand, four hundred sixty-five".