991343199 has 72 divisors (see below), whose sum is σ = 1708000896. Its totient is φ = 500623200.

The previous prime is 991343167. The next prime is 991343209.

991343199 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 991343199 - 2⁵ = 991343167 is a prime.

It is a super-2 number, since 2×991343199² = 1965522676407107202, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (991343299) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 4698204 + ... + 4698414.

Almost surely, 2^991343199 is an apocalyptic number.

991343199 is a deficient number, since it is larger than the sum of its proper divisors (716657697).

991343199 is a wasteful number, since it uses less digits than its factorization.

991343199 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 329 (or 275 counting only the distinct ones).

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

The square root of 991343199 is about 31485.6030432958. The cubic root of 991343199 is about 997.1060326990.

The spelling of 991343199 in words is "nine hundred ninety-one million, three hundred forty-three thousand, one hundred ninety-nine".