198955251 has 32 divisors (see below), whose sum is σ = 338476800. Its totient is φ = 114229440.

The previous prime is 198955219. The next prime is 198955261. The reversal of 198955251 is 152559891.

198955251 is a `hidden beast` number, since 1 + 98 + 9 + 552 + 5 + 1 = 666.

It is not a de Polignac number, because 198955251 - 2⁵ = 198955219 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 198955197 and 198955206.

It is not an unprimeable number, because it can be changed into a prime (198955261) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 11986 + ... + 23271.

It is an arithmetic number, because the mean of its divisors is an integer number (10577400).

Almost surely, 2^198955251 is an apocalyptic number.

198955251 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

198955251 is a deficient number, since it is larger than the sum of its proper divisors (139521549).

198955251 is a wasteful number, since it uses less digits than its factorization.

198955251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35296 (or 35290 counting only the distinct ones).

The product of its digits is 162000, while the sum is 45.

The square root of 198955251 is about 14105.1498042382. The cubic root of 198955251 is about 583.7834811836.

The spelling of 198955251 in words is "one hundred ninety-eight million, nine hundred fifty-five thousand, two hundred fifty-one".