225981761 has 2 divisors, whose sum is σ = 225981762. Its totient is φ = 225981760.

The previous prime is 225981757. The next prime is 225981823. The reversal of 225981761 is 167189522.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 172764736 + 53217025 = 13144^2 + 7295^2 .

It is a cyclic number.

It is not a de Polignac number, because 225981761 - 2² = 225981757 is a prime.

It is a super-2 number, since 2×225981761² = 102135512609322242, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (225980761) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 112990880 + 112990881.

It is an arithmetic number, because the mean of its divisors is an integer number (112990881).

Almost surely, 2^225981761 is an apocalyptic number.

It is an amenable number.

225981761 is a deficient number, since it is larger than the sum of its proper divisors (1).

225981761 is an equidigital number, since it uses as much as digits as its factorization.

225981761 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 60480, while the sum is 41.

The square root of 225981761 is about 15032.6897460168. The cubic root of 225981761 is about 609.1035484062.

The spelling of 225981761 in words is "two hundred twenty-five million, nine hundred eighty-one thousand, seven hundred sixty-one".