198815125 has 8 divisors (see below), whose sum is σ = 248121432. Its totient is φ = 159052000.

The previous prime is 198815093. The next prime is 198815161. The reversal of 198815125 is 521518891.

It can be written as a sum of positive squares in 4 ways, for example, as 5299204 + 193515921 = 2302^2 + 13911^2 .

It is not a de Polignac number, because 198815125 - 2⁵ = 198815093 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 795136 + ... + 795385.

It is an arithmetic number, because the mean of its divisors is an integer number (31015179).

Almost surely, 2^198815125 is an apocalyptic number.

It is an amenable number.

198815125 is a deficient number, since it is larger than the sum of its proper divisors (49306307).

198815125 is an equidigital number, since it uses as much as digits as its factorization.

198815125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1590536 (or 1590526 counting only the distinct ones).

The product of its digits is 28800, while the sum is 40.

The square root of 198815125 is about 14100.1817364174. The cubic root of 198815125 is about 583.6463943159.

The spelling of 198815125 in words is "one hundred ninety-eight million, eight hundred fifteen thousand, one hundred twenty-five".