199491013 has 8 divisors (see below), whose sum is σ = 215666720. Its totient is φ = 183882960.

The previous prime is 199491007. The next prime is 199491031. The reversal of 199491013 is 310194991.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-199491013 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (199491053) 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 7 ways as a sum of consecutive naturals, for example, 141183 + ... + 142588.

It is an arithmetic number, because the mean of its divisors is an integer number (26958340).

Almost surely, 2^199491013 is an apocalyptic number.

It is an amenable number.

199491013 is a deficient number, since it is larger than the sum of its proper divisors (16175707).

199491013 is a wasteful number, since it uses less digits than its factorization.

199491013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 283827.

The product of its (nonzero) digits is 8748, while the sum is 37.

The square root of 199491013 is about 14124.1287518912. The cubic root of 199491013 is about 584.3070305306.

The spelling of 199491013 in words is "one hundred ninety-nine million, four hundred ninety-one thousand, thirteen".