225761681 has 2 divisors, whose sum is σ = 225761682. Its totient is φ = 225761680.

The previous prime is 225761617. The next prime is 225761687. The reversal of 225761681 is 186167522.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 163430656 + 62331025 = 12784^2 + 7895^2 .

It is a cyclic number.

It is not a de Polignac number, because 225761681 - 2⁶ = 225761617 is a prime.

It is a super-2 number, since 2×225761681² = 101936673215891522, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (225761687) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 112880840 + 112880841.

It is an arithmetic number, because the mean of its divisors is an integer number (112880841).

Almost surely, 2^225761681 is an apocalyptic number.

It is an amenable number.

225761681 is a deficient number, since it is larger than the sum of its proper divisors (1).

225761681 is an equidigital number, since it uses as much as digits as its factorization.

225761681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 40320, while the sum is 38.

The square root of 225761681 is about 15025.3679156286. The cubic root of 225761681 is about 608.9057521345.

The spelling of 225761681 in words is "two hundred twenty-five million, seven hundred sixty-one thousand, six hundred eighty-one".