991384138333 has 8 divisors (see below), whose sum is σ = 1016898727680. Its totient is φ = 966053770320.

The previous prime is 991384138319. The next prime is 991384138453. The reversal of 991384138333 is 333831483199.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-991384138333 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 (991384138033) 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, 46044433 + ... + 46065958.

It is an arithmetic number, because the mean of its divisors is an integer number (127112340960).

Almost surely, 2^991384138333 is an apocalyptic number.

It is an amenable number.

991384138333 is a deficient number, since it is larger than the sum of its proper divisors (25514589347).

991384138333 is a wasteful number, since it uses less digits than its factorization.

991384138333 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92110667.

The product of its digits is 5038848, while the sum is 55.

The spelling of 991384138333 in words is "nine hundred ninety-one billion, three hundred eighty-four million, one hundred thirty-eight thousand, three hundred thirty-three".