225979681 has 2 divisors, whose sum is σ = 225979682. Its totient is φ = 225979680.

The previous prime is 225979661. The next prime is 225979697. The reversal of 225979681 is 186979522.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 171086400 + 54893281 = 13080^2 + 7409^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-225979681 is a prime.

It is a super-2 number, since 2×225979681² = 102133632449723522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (225979601) 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, 112989840 + 112989841.

It is an arithmetic number, because the mean of its divisors is an integer number (112989841).

Almost surely, 2^225979681 is an apocalyptic number.

It is an amenable number.

225979681 is a deficient number, since it is larger than the sum of its proper divisors (1).

225979681 is an equidigital number, since it uses as much as digits as its factorization.

225979681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 544320, while the sum is 49.

The square root of 225979681 is about 15032.6205632950. The cubic root of 225979681 is about 609.1016796134.

The spelling of 225979681 in words is "two hundred twenty-five million, nine hundred seventy-nine thousand, six hundred eighty-one".