225633521 has 2 divisors, whose sum is σ = 225633522. Its totient is φ = 225633520.

The previous prime is 225633517. The next prime is 225633553. The reversal of 225633521 is 125336522.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 222159025 + 3474496 = 14905^2 + 1864^2 .

It is a cyclic number.

It is not a de Polignac number, because 225633521 - 2² = 225633517 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (225663521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 112816760 + 112816761.

It is an arithmetic number, because the mean of its divisors is an integer number (112816761).

Almost surely, 2^225633521 is an apocalyptic number.

It is an amenable number.

225633521 is a deficient number, since it is larger than the sum of its proper divisors (1).

225633521 is an equidigital number, since it uses as much as digits as its factorization.

225633521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10800, while the sum is 29.

The square root of 225633521 is about 15021.1025227844. The cubic root of 225633521 is about 608.7905094707.

The spelling of 225633521 in words is "two hundred twenty-five million, six hundred thirty-three thousand, five hundred twenty-one".