199313991 has 12 divisors (see below), whose sum is σ = 288827760. Its totient is φ = 132446880.

The previous prime is 199313963. The next prime is 199313993.

199313991 is nontrivially palindromic in base 10.

199313991 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 199313991 - 2⁹ = 199313479 is a prime.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (199313993) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 32806 + ... + 38403.

It is an arithmetic number, because the mean of its divisors is an integer number (24068980).

Almost surely, 2^199313991 is an apocalyptic number.

199313991 is a deficient number, since it is larger than the sum of its proper divisors (89513769).

199313991 is a wasteful number, since it uses less digits than its factorization.

199313991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71526 (or 71523 counting only the distinct ones).

The product of its digits is 59049, while the sum is 45.

The square root of 199313991 is about 14117.8607090451. The cubic root of 199313991 is about 584.1341475392.

The spelling of 199313991 in words is "one hundred ninety-nine million, three hundred thirteen thousand, nine hundred ninety-one".