225197887 has 4 divisors (see below), whose sum is σ = 225228520. Its totient is φ = 225167256.

The previous prime is 225197851. The next prime is 225197897. The reversal of 225197887 is 788791522.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a 3-Lehmer number, since φ(225197887) divides (225197887-1)³.

It is a cyclic number.

It is not a de Polignac number, because 225197887 - 2¹⁹ = 224673599 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 225197887.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (225197897) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3064 + ... + 21442.

It is an arithmetic number, because the mean of its divisors is an integer number (56307130).

Almost surely, 2^225197887 is an apocalyptic number.

225197887 is the 12253-rd pentagonal number.

225197887 is a deficient number, since it is larger than the sum of its proper divisors (30633).

225197887 is a wasteful number, since it uses less digits than its factorization.

225197887 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30632.

The product of its digits is 564480, while the sum is 49.

The square root of 225197887 is about 15006.5947836276. The cubic root of 225197887 is about 608.3984567466.

The spelling of 225197887 in words is "two hundred twenty-five million, one hundred ninety-seven thousand, eight hundred eighty-seven".