225405581 has 2 divisors, whose sum is σ = 225405582. Its totient is φ = 225405580.

The previous prime is 225405559. The next prime is 225405599. The reversal of 225405581 is 185504522.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 184009225 + 41396356 = 13565^2 + 6434^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-225405581 is a prime.

It is a super-2 number, since 2×225405581² = 101615351891895122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (225405541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 112702790 + 112702791.

It is an arithmetic number, because the mean of its divisors is an integer number (112702791).

Almost surely, 2^225405581 is an apocalyptic number.

It is an amenable number.

225405581 is a deficient number, since it is larger than the sum of its proper divisors (1).

225405581 is an equidigital number, since it uses as much as digits as its factorization.

225405581 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16000, while the sum is 32.

The square root of 225405581 is about 15013.5132797091. The cubic root of 225405581 is about 608.5854358287.

The spelling of 225405581 in words is "two hundred twenty-five million, four hundred five thousand, five hundred eighty-one".