225491389 has 4 divisors (see below), whose sum is σ = 226027420. Its totient is φ = 224955360.

The previous prime is 225491377. The next prime is 225491401. The reversal of 225491389 is 983194522.

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

It is an interprime number because it is at equal distance from previous prime (225491377) and next prime (225491401).

It can be written as a sum of positive squares in 2 ways, for example, as 97416900 + 128074489 = 9870^2 + 11317^2 .

It is a cyclic number.

It is not a de Polignac number, because 225491389 - 2⁷ = 225491261 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (225491369) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 267384 + ... + 268225.

It is an arithmetic number, because the mean of its divisors is an integer number (56506855).

Almost surely, 2^225491389 is an apocalyptic number.

It is an amenable number.

225491389 is a deficient number, since it is larger than the sum of its proper divisors (536031).

225491389 is an equidigital number, since it uses as much as digits as its factorization.

225491389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 536030.

The product of its digits is 155520, while the sum is 43.

The square root of 225491389 is about 15016.3707000060. The cubic root of 225491389 is about 608.6626520089.

The spelling of 225491389 in words is "two hundred twenty-five million, four hundred ninety-one thousand, three hundred eighty-nine".