225717187 has 4 divisors (see below), whose sum is σ = 227908720. Its totient is φ = 223525656.

The previous prime is 225717137. The next prime is 225717197. The reversal of 225717187 is 781717522.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 781717522 = 2 ⋅390858761.

It is not a de Polignac number, because 225717187 - 2⁷ = 225717059 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (225717127) 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, 1095612 + ... + 1095817.

It is an arithmetic number, because the mean of its divisors is an integer number (56977180).

Almost surely, 2^225717187 is an apocalyptic number.

225717187 is a deficient number, since it is larger than the sum of its proper divisors (2191533).

225717187 is a wasteful number, since it uses less digits than its factorization.

225717187 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2191532.

The product of its digits is 54880, while the sum is 40.

The square root of 225717187 is about 15023.8872133679. The cubic root of 225717187 is about 608.8657476595.

The spelling of 225717187 in words is "two hundred twenty-five million, seven hundred seventeen thousand, one hundred eighty-seven".