991343343199 has 4 divisors (see below), whose sum is σ = 1081465465320. Its totient is φ = 901221221080.

The previous prime is 991343343191. The next prime is 991343343209.

991343343199 is nontrivially palindromic in base 10.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 991343343199 - 2³ = 991343343191 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (991343343191) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 45061061044 + ... + 45061061065.

It is an arithmetic number, because the mean of its divisors is an integer number (270366366330).

Almost surely, 2^991343343199 is an apocalyptic number.

991343343199 is a deficient number, since it is larger than the sum of its proper divisors (90122122121).

991343343199 is a wasteful number, since it uses less digits than its factorization.

991343343199 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90122122120.

The product of its digits is 8503056, while the sum is 58.

The spelling of 991343343199 in words is "nine hundred ninety-one billion, three hundred forty-three million, three hundred forty-three thousand, one hundred ninety-nine".