991243342199 has 8 divisors (see below), whose sum is σ = 1138269866880. Its totient is φ = 853702399800.

The previous prime is 991243342189. The next prime is 991243342213.

991243342199 is nontrivially palindromic in base 10.

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

It is a cyclic number.

It is not a de Polignac number, because 991243342199 - 2²⁸ = 990974906743 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 (991243342189) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2371395347 + ... + 2371395764.

It is an arithmetic number, because the mean of its divisors is an integer number (142283733360).

Almost surely, 2^991243342199 is an apocalyptic number.

991243342199 is a deficient number, since it is larger than the sum of its proper divisors (147026524681).

991243342199 is a wasteful number, since it uses less digits than its factorization.

991243342199 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4742791141.

The product of its digits is 3779136, while the sum is 56.

The spelling of 991243342199 in words is "nine hundred ninety-one billion, two hundred forty-three million, three hundred forty-two thousand, one hundred ninety-nine".