991084983271 has 8 divisors (see below), whose sum is σ = 1049418903600. Its totient is φ = 932754930048.

The previous prime is 991084983257. The next prime is 991084983283. The reversal of 991084983271 is 172389480199.

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 991084983271 - 2⁹ = 991084982759 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 (991084983211) 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, 430621 + ... + 1472278.

It is an arithmetic number, because the mean of its divisors is an integer number (131177362950).

Almost surely, 2^991084983271 is an apocalyptic number.

991084983271 is a deficient number, since it is larger than the sum of its proper divisors (58333920329).

991084983271 is a wasteful number, since it uses less digits than its factorization.

991084983271 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1933553.

The product of its (nonzero) digits is 7838208, while the sum is 61.

The spelling of 991084983271 in words is "nine hundred ninety-one billion, eighty-four million, nine hundred eighty-three thousand, two hundred seventy-one".