225601997 has 2 divisors, whose sum is σ = 225601998. Its totient is φ = 225601996.

The previous prime is 225601939. The next prime is 225602011. The reversal of 225601997 is 799106522.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 173343556 + 52258441 = 13166^2 + 7229^2 .

It is a cyclic number.

It is not a de Polignac number, because 225601997 - 2¹⁸ = 225339853 is a prime.

It is a super-2 number, since 2×225601997² = 101792522100776018, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (225601297) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 112800998 + 112800999.

It is an arithmetic number, because the mean of its divisors is an integer number (112800999).

Almost surely, 2^225601997 is an apocalyptic number.

It is an amenable number.

225601997 is a deficient number, since it is larger than the sum of its proper divisors (1).

225601997 is an equidigital number, since it uses as much as digits as its factorization.

225601997 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 68040, while the sum is 41.

The square root of 225601997 is about 15020.0531623560. The cubic root of 225601997 is about 608.7621561099.

The spelling of 225601997 in words is "two hundred twenty-five million, six hundred one thousand, nine hundred ninety-seven".