225521957 has 2 divisors, whose sum is σ = 225521958. Its totient is φ = 225521956.

The previous prime is 225521953. The next prime is 225521987. The reversal of 225521957 is 759125522.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 225420196 + 101761 = 15014^2 + 319^2 .

It is a cyclic number.

It is not a de Polignac number, because 225521957 - 2² = 225521953 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 225521957.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (225521953) 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, 112760978 + 112760979.

It is an arithmetic number, because the mean of its divisors is an integer number (112760979).

Almost surely, 2^225521957 is an apocalyptic number.

It is an amenable number.

225521957 is a deficient number, since it is larger than the sum of its proper divisors (1).

225521957 is an equidigital number, since it uses as much as digits as its factorization.

225521957 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 63000, while the sum is 38.

The square root of 225521957 is about 15017.3884880162. The cubic root of 225521957 is about 608.6901545510.

The spelling of 225521957 in words is "two hundred twenty-five million, five hundred twenty-one thousand, nine hundred fifty-seven".