9991359 has 48 divisors (see below), whose sum is σ = 18420480. Its totient is φ = 5080320.

The previous prime is 9991357. The next prime is 9991379. The reversal of 9991359 is 9531999.

It is not a de Polignac number, because 9991359 - 2¹ = 9991357 is a prime.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is an Ulam number.

9991359 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9991357) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 20104 + ... + 20594.

It is an arithmetic number, because the mean of its divisors is an integer number (383760).

Almost surely, 2^9991359 is an apocalyptic number.

9991359 is a deficient number, since it is larger than the sum of its proper divisors (8429121).

9991359 is a wasteful number, since it uses less digits than its factorization.

9991359 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 540 (or 537 counting only the distinct ones).

The product of its digits is 98415, while the sum is 45.

The square root of 9991359 is about 3160.9111028310. The cubic root of 9991359 is about 215.3813962202.

The spelling of 9991359 in words is "nine million, nine hundred ninety-one thousand, three hundred fifty-nine".