198143631 has 32 divisors (see below), whose sum is σ = 347059200. Its totient is φ = 109317600.

The previous prime is 198143629. The next prime is 198143713. The reversal of 198143631 is 136341891.

198143631 is a `hidden beast` number, since 1 + 9 + 8 + 14 + 3 + 631 = 666.

It is not a de Polignac number, because 198143631 - 2¹ = 198143629 is a prime.

It is a super-3 number, since 3×198143631³ (a number of 26 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (198141631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 12595 + ... + 23556.

It is an arithmetic number, because the mean of its divisors is an integer number (10845600).

Almost surely, 2^198143631 is an apocalyptic number.

198143631 is a deficient number, since it is larger than the sum of its proper divisors (148915569).

198143631 is a wasteful number, since it uses less digits than its factorization.

198143631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36196 (or 36190 counting only the distinct ones).

The product of its digits is 15552, while the sum is 36.

The square root of 198143631 is about 14076.3500595858. The cubic root of 198143631 is about 582.9885685929.

The spelling of 198143631 in words is "one hundred ninety-eight million, one hundred forty-three thousand, six hundred thirty-one".