225521143 has 2 divisors, whose sum is σ = 225521144. Its totient is φ = 225521142.

The previous prime is 225521123. The next prime is 225521147. The reversal of 225521143 is 341125522.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-225521143 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (225521147) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 112760571 + 112760572.

It is an arithmetic number, because the mean of its divisors is an integer number (112760572).

Almost surely, 2^225521143 is an apocalyptic number.

225521143 is a deficient number, since it is larger than the sum of its proper divisors (1).

225521143 is an equidigital number, since it uses as much as digits as its factorization.

225521143 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2400, while the sum is 25.

The square root of 225521143 is about 15017.3613860758. The cubic root of 225521143 is about 608.6894222137.

Adding to 225521143 its reverse (341125522), we get a palindrome (566646665).

The spelling of 225521143 in words is "two hundred twenty-five million, five hundred twenty-one thousand, one hundred forty-three".