991189139713 has 4 divisors (see below), whose sum is σ = 994183669168. Its totient is φ = 988194610260.

The previous prime is 991189139669. The next prime is 991189139777. The reversal of 991189139713 is 317931981199.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 991189139713 - 2²⁵ = 991155585281 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (991189130713) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1497264231 + ... + 1497264892.

It is an arithmetic number, because the mean of its divisors is an integer number (248545917292).

Almost surely, 2^991189139713 is an apocalyptic number.

It is an amenable number.

991189139713 is a deficient number, since it is larger than the sum of its proper divisors (2994529455).

991189139713 is a wasteful number, since it uses less digits than its factorization.

991189139713 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2994529454.

The product of its digits is 3306744, while the sum is 61.

The spelling of 991189139713 in words is "nine hundred ninety-one billion, one hundred eighty-nine million, one hundred thirty-nine thousand, seven hundred thirteen".