191999056 has 10 divisors (see below), whose sum is σ = 371998202. Its totient is φ = 95999520.

The previous prime is 191999029. The next prime is 191999057. The reversal of 191999056 is 650999191.

It can be written as a sum of positive squares in only one way, i.e., 146894400 + 45104656 = 12120^2 + 6716^2 .

It is a super-3 number, since 3×191999056³ (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 (191999057) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5999955 + ... + 5999986.

Almost surely, 2^191999056 is an apocalyptic number.

191999056 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

191999056 is a deficient number, since it is larger than the sum of its proper divisors (179999146).

191999056 is a wasteful number, since it uses less digits than its factorization.

191999056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11999949 (or 11999943 counting only the distinct ones).

The product of its (nonzero) digits is 196830, while the sum is 49.

The square root of 191999056 is about 13856.3723968433. The cubic root of 191999056 is about 576.8988826467.

The spelling of 191999056 in words is "one hundred ninety-one million, nine hundred ninety-nine thousand, fifty-six".