199128531 has 64 divisors (see below), whose sum is σ = 349470720. Its totient is φ = 98081280.

The previous prime is 199128491. The next prime is 199128533. The reversal of 199128531 is 135821991.

It is not a de Polignac number, because 199128531 - 2⁷ = 199128403 is a prime.

It is a super-2 number, since 2×199128531² = 79304343716435922, 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 199128531.

It is not an unprimeable number, because it can be changed into a prime (199128533) 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 63 ways as a sum of consecutive naturals, for example, 209800 + ... + 210746.

It is an arithmetic number, because the mean of its divisors is an integer number (5460480).

Almost surely, 2^199128531 is an apocalyptic number.

199128531 is a deficient number, since it is larger than the sum of its proper divisors (150342189).

199128531 is a wasteful number, since it uses less digits than its factorization.

199128531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1024.

The product of its digits is 19440, while the sum is 39.

The square root of 199128531 is about 14111.2909048039. The cubic root of 199128531 is about 583.9529140041.

The spelling of 199128531 in words is "one hundred ninety-nine million, one hundred twenty-eight thousand, five hundred thirty-one".