199991052 has 24 divisors (see below), whose sum is σ = 518495600. Its totient is φ = 66663648.

The previous prime is 199991041. The next prime is 199991053. The reversal of 199991052 is 250199991.

It is a junction number, because it is equal to n+sod(n) for n = 199990989 and 199991007.

It is not an unprimeable number, because it can be changed into a prime (199991053) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 925777 + ... + 925992.

Almost surely, 2^199991052 is an apocalyptic number.

199991052 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

199991052 is an abundant number, since it is smaller than the sum of its proper divisors (318504548).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

199991052 is a wasteful number, since it uses less digits than its factorization.

199991052 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1851782 (or 1851774 counting only the distinct ones).

The product of its (nonzero) digits is 65610, while the sum is 45.

The square root of 199991052 is about 14141.8192606185. The cubic root of 199991052 is about 584.7948261423.

The spelling of 199991052 in words is "one hundred ninety-nine million, nine hundred ninety-one thousand, fifty-two".