225979661 has 2 divisors, whose sum is σ = 225979662. Its totient is φ = 225979660.

The previous prime is 225979601. The next prime is 225979681. The reversal of 225979661 is 166979522.

225979661 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 177049636 + 48930025 = 13306^2 + 6995^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-225979661 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (225979601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 112989830 + 112989831.

It is an arithmetic number, because the mean of its divisors is an integer number (112989831).

Almost surely, 2^225979661 is an apocalyptic number.

It is an amenable number.

225979661 is a deficient number, since it is larger than the sum of its proper divisors (1).

225979661 is an equidigital number, since it uses as much as digits as its factorization.

225979661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 408240, while the sum is 47.

The square root of 225979661 is about 15032.6198980750. The cubic root of 225979661 is about 609.1016616442.

The spelling of 225979661 in words is "two hundred twenty-five million, nine hundred seventy-nine thousand, six hundred sixty-one".