199490691 has 16 divisors (see below), whose sum is σ = 271007744. Its totient is φ = 130499424.

The previous prime is 199490659. The next prime is 199490723. The reversal of 199490691 is 196094991.

It is an interprime number because it is at equal distance from previous prime (199490659) and next prime (199490723).

It is not a de Polignac number, because 199490691 - 2⁵ = 199490659 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 199490691.

It is not an unprimeable number, because it can be changed into a prime (199490651) 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 15 ways as a sum of consecutive naturals, for example, 53886 + ... + 57468.

It is an arithmetic number, because the mean of its divisors is an integer number (16937984).

Almost surely, 2^199490691 is an apocalyptic number.

199490691 is a deficient number, since it is larger than the sum of its proper divisors (71517053).

199490691 is a wasteful number, since it uses less digits than its factorization.

199490691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3930.

The product of its (nonzero) digits is 157464, while the sum is 48.

The square root of 199490691 is about 14124.1173529534. The cubic root of 199490691 is about 584.3067161523.

The spelling of 199490691 in words is "one hundred ninety-nine million, four hundred ninety thousand, six hundred ninety-one".