225720187 has 16 divisors (see below), whose sum is σ = 281746944. Its totient is φ = 175680000.

The previous prime is 225720151. The next prime is 225720197. The reversal of 225720187 is 781027522.

It is a cyclic number.

It is not a de Polignac number, because 225720187 - 2¹⁵ = 225687419 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (225720107) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 122362 + ... + 124192.

It is an arithmetic number, because the mean of its divisors is an integer number (17609184).

Almost surely, 2^225720187 is an apocalyptic number.

225720187 is a deficient number, since it is larger than the sum of its proper divisors (56026757).

225720187 is a wasteful number, since it uses less digits than its factorization.

225720187 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3450.

The product of its (nonzero) digits is 15680, while the sum is 34.

The square root of 225720187 is about 15023.9870540413. The cubic root of 225720187 is about 608.8684451194.

The spelling of 225720187 in words is "two hundred twenty-five million, seven hundred twenty thousand, one hundred eighty-seven".