225194687 has 4 divisors (see below), whose sum is σ = 227907960. Its totient is φ = 222481416.

The previous prime is 225194639. The next prime is 225194701. The reversal of 225194687 is 786491522.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 786491522 = 2 ⋅393245761.

It is a cyclic number.

It is not a de Polignac number, because 225194687 - 2⁶ = 225194623 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 (225194287) 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, 1356512 + ... + 1356677.

It is an arithmetic number, because the mean of its divisors is an integer number (56976990).

Almost surely, 2^225194687 is an apocalyptic number.

225194687 is a deficient number, since it is larger than the sum of its proper divisors (2713273).

225194687 is an equidigital number, since it uses as much as digits as its factorization.

225194687 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2713272.

The product of its digits is 241920, while the sum is 44.

The square root of 225194687 is about 15006.4881634578. The cubic root of 225194687 is about 608.3955750081.

The spelling of 225194687 in words is "two hundred twenty-five million, one hundred ninety-four thousand, six hundred eighty-seven".