199081931 has 4 divisors (see below), whose sum is σ = 200843832. Its totient is φ = 197320032.

The previous prime is 199081921. The next prime is 199081933. The reversal of 199081931 is 139180991.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 199081931 - 2¹⁰ = 199080907 is a prime.

It is a super-2 number, since 2×199081931² = 79267230501377522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (199081933) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 880781 + ... + 881006.

It is an arithmetic number, because the mean of its divisors is an integer number (50210958).

Almost surely, 2^199081931 is an apocalyptic number.

199081931 is a deficient number, since it is larger than the sum of its proper divisors (1761901).

199081931 is a wasteful number, since it uses less digits than its factorization.

199081931 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1761900.

The product of its (nonzero) digits is 17496, while the sum is 41.

The square root of 199081931 is about 14109.6396481271. The cubic root of 199081931 is about 583.9073582875.

The spelling of 199081931 in words is "one hundred ninety-nine million, eighty-one thousand, nine hundred thirty-one".