225660989 has 2 divisors, whose sum is σ = 225660990. Its totient is φ = 225660988.

The previous prime is 225660973. The next prime is 225661001. The reversal of 225660989 is 989066522.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 160858489 + 64802500 = 12683^2 + 8050^2 .

It is a cyclic number.

It is not a de Polignac number, because 225660989 - 2⁴ = 225660973 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (225660389) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 112830494 + 112830495.

It is an arithmetic number, because the mean of its divisors is an integer number (112830495).

Almost surely, 2^225660989 is an apocalyptic number.

It is an amenable number.

225660989 is a deficient number, since it is larger than the sum of its proper divisors (1).

225660989 is an equidigital number, since it uses as much as digits as its factorization.

225660989 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 466560, while the sum is 47.

The square root of 225660989 is about 15022.0168086712. The cubic root of 225660989 is about 608.8152126251.

The spelling of 225660989 in words is "two hundred twenty-five million, six hundred sixty thousand, nine hundred eighty-nine".