225657997 has 2 divisors, whose sum is σ = 225657998. Its totient is φ = 225657996.

The previous prime is 225657977. The next prime is 225658001. The reversal of 225657997 is 799756522.

225657997 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., 225630441 + 27556 = 15021^2 + 166^2 .

It is a cyclic number.

It is not a de Polignac number, because 225657997 - 2⁷ = 225657869 is a prime.

It is a super-2 number, since 2×225657997² = 101843063220104018, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (225657907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 112828998 + 112828999.

It is an arithmetic number, because the mean of its divisors is an integer number (112828999).

Almost surely, 2^225657997 is an apocalyptic number.

It is an amenable number.

225657997 is a deficient number, since it is larger than the sum of its proper divisors (1).

225657997 is an equidigital number, since it uses as much as digits as its factorization.

225657997 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2381400, while the sum is 52.

The square root of 225657997 is about 15021.9172211805. The cubic root of 225657997 is about 608.8125218881.

The spelling of 225657997 in words is "two hundred twenty-five million, six hundred fifty-seven thousand, nine hundred ninety-seven".