198381531 has 16 divisors (see below), whose sum is σ = 274212864. Its totient is φ = 127469664.

The previous prime is 198381529. The next prime is 198381563. The reversal of 198381531 is 135183891.

It is not a de Polignac number, because 198381531 - 2¹ = 198381529 is a prime.

It is a super-2 number, since 2×198381531² = 78710463683807922, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 198381531.

It is not an unprimeable number, because it can be changed into a prime (198381571) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3526 + ... + 20228.

It is an arithmetic number, because the mean of its divisors is an integer number (17138304).

Almost surely, 2^198381531 is an apocalyptic number.

198381531 is a deficient number, since it is larger than the sum of its proper divisors (75831333).

198381531 is a wasteful number, since it uses less digits than its factorization.

198381531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16850.

The product of its digits is 25920, while the sum is 39.

The square root of 198381531 is about 14084.7978686242. The cubic root of 198381531 is about 583.2217958900.

The spelling of 198381531 in words is "one hundred ninety-eight million, three hundred eighty-one thousand, five hundred thirty-one".