198521025 has 24 divisors (see below), whose sum is σ = 345498720. Its totient is φ = 100304640.

The previous prime is 198521009. The next prime is 198521077. The reversal of 198521025 is 520125891.

It is not a de Polignac number, because 198521025 - 2⁴ = 198521009 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 68232 + ... + 71081.

It is an arithmetic number, because the mean of its divisors is an integer number (14395780).

Almost surely, 2^198521025 is an apocalyptic number.

198521025 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

198521025 is a deficient number, since it is larger than the sum of its proper divisors (146977695).

198521025 is a wasteful number, since it uses less digits than its factorization.

198521025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 139345 (or 139340 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 33.

The square root of 198521025 is about 14089.7489331783. The cubic root of 198521025 is about 583.3584633165.

The spelling of 198521025 in words is "one hundred ninety-eight million, five hundred twenty-one thousand, twenty-five".