198531281 has 8 divisors (see below), whose sum is σ = 214890984. Its totient is φ = 182327040.

The previous prime is 198531257. The next prime is 198531329. The reversal of 198531281 is 182135891.

It can be written as a sum of positive squares in 4 ways, for example, as 15335056 + 183196225 = 3916^2 + 13535^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 198531281 - 2⁶ = 198531217 is a prime.

It is a super-2 number, since 2×198531281² = 78829339071001922, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (198531241) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36200 + ... + 41321.

It is an arithmetic number, because the mean of its divisors is an integer number (26861373).

Almost surely, 2^198531281 is an apocalyptic number.

It is an amenable number.

198531281 is a deficient number, since it is larger than the sum of its proper divisors (16359703).

198531281 is a wasteful number, since it uses less digits than its factorization.

198531281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77731.

The product of its digits is 17280, while the sum is 38.

The square root of 198531281 is about 14090.1128810241. The cubic root of 198531281 is about 583.3685089718.

The spelling of 198531281 in words is "one hundred ninety-eight million, five hundred thirty-one thousand, two hundred eighty-one".