198481257 has 12 divisors (see below), whose sum is σ = 308748804. Its totient is φ = 122142240.

The previous prime is 198481229. The next prime is 198481267. The reversal of 198481257 is 752184891.

It can be written as a sum of positive squares in 2 ways, for example, as 94012416 + 104468841 = 9696^2 + 10221^2 .

It is not a de Polignac number, because 198481257 - 2⁶ = 198481193 is a prime.

It is not an unprimeable number, because it can be changed into a prime (198481267) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 848094 + ... + 848327.

It is an arithmetic number, because the mean of its divisors is an integer number (25729067).

Almost surely, 2^198481257 is an apocalyptic number.

It is an amenable number.

198481257 is a deficient number, since it is larger than the sum of its proper divisors (110267547).

198481257 is a wasteful number, since it uses less digits than its factorization.

198481257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1696440 (or 1696437 counting only the distinct ones).

The product of its digits is 161280, while the sum is 45.

The square root of 198481257 is about 14088.3376237227. The cubic root of 198481257 is about 583.3195076632.

The spelling of 198481257 in words is "one hundred ninety-eight million, four hundred eighty-one thousand, two hundred fifty-seven".