199343991 has 48 divisors (see below), whose sum is σ = 351545600. Its totient is φ = 98081280.

The previous prime is 199343987. The next prime is 199344007.

199343991 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 199343991 - 2² = 199343987 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 199343991.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (199343951) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 46215 + ... + 50343.

Almost surely, 2^199343991 is an apocalyptic number.

199343991 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

199343991 is a deficient number, since it is larger than the sum of its proper divisors (152201609).

199343991 is a wasteful number, since it uses less digits than its factorization.

199343991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4180 (or 4169 counting only the distinct ones).

The product of its digits is 236196, while the sum is 48.

The square root of 199343991 is about 14118.9231529887. The cubic root of 199343991 is about 584.1634533014.

The spelling of 199343991 in words is "one hundred ninety-nine million, three hundred forty-three thousand, nine hundred ninety-one".