225989391 has 4 divisors (see below), whose sum is σ = 301319192. Its totient is φ = 150659592.

The previous prime is 225989389. The next prime is 225989399. The reversal of 225989391 is 193989522.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 225989391 - 2¹ = 225989389 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 225989391.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (225989399) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 37664896 + ... + 37664901.

It is an arithmetic number, because the mean of its divisors is an integer number (75329798).

Almost surely, 2^225989391 is an apocalyptic number.

225989391 is a deficient number, since it is larger than the sum of its proper divisors (75329801).

225989391 is an equidigital number, since it uses as much as digits as its factorization.

225989391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75329800.

The product of its digits is 349920, while the sum is 48.

The square root of 225989391 is about 15032.9435241406. The cubic root of 225989391 is about 609.1104035431.

The spelling of 225989391 in words is "two hundred twenty-five million, nine hundred eighty-nine thousand, three hundred ninety-one".