225506557 has 2 divisors, whose sum is σ = 225506558. Its totient is φ = 225506556.

The previous prime is 225506551. The next prime is 225506587. The reversal of 225506557 is 755605522.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 217090756 + 8415801 = 14734^2 + 2901^2 .

It is a cyclic number.

It is not a de Polignac number, because 225506557 - 2³ = 225506549 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (225506551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 112753278 + 112753279.

It is an arithmetic number, because the mean of its divisors is an integer number (112753279).

Almost surely, 2^225506557 is an apocalyptic number.

It is an amenable number.

225506557 is a deficient number, since it is larger than the sum of its proper divisors (1).

225506557 is an equidigital number, since it uses as much as digits as its factorization.

225506557 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 105000, while the sum is 37.

The square root of 225506557 is about 15016.8757403130. The cubic root of 225506557 is about 608.6762992234.

The spelling of 225506557 in words is "two hundred twenty-five million, five hundred six thousand, five hundred fifty-seven".