9891479311 has 4 divisors (see below), whose sum is σ = 11304547792. Its totient is φ = 8478410832.

The previous prime is 9891479309. The next prime is 9891479327. The reversal of 9891479311 is 1139741989.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1139741989 = 5849 ⋅194861.

It is a cyclic number.

It is not a de Polignac number, because 9891479311 - 2¹ = 9891479309 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 (9891479111) 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, 706534230 + ... + 706534243.

It is an arithmetic number, because the mean of its divisors is an integer number (2826136948).

Almost surely, 2^9891479311 is an apocalyptic number.

9891479311 is a deficient number, since it is larger than the sum of its proper divisors (1413068481).

9891479311 is a wasteful number, since it uses less digits than its factorization.

9891479311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1413068480.

The product of its digits is 489888, while the sum is 52.

The square root of 9891479311 is about 99455.9164202915. The cubic root of 9891479311 is about 2146.6129695775.

The spelling of 9891479311 in words is "nine billion, eight hundred ninety-one million, four hundred seventy-nine thousand, three hundred eleven".