9991356354 has 48 divisors (see below), whose sum is σ = 25816182912. Its totient is φ = 2730556224.

The previous prime is 9991356343. The next prime is 9991356391. The reversal of 9991356354 is 4536531999.

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 9991356354.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1720939 + ... + 1726734.

It is an arithmetic number, because the mean of its divisors is an integer number (537837144).

Almost surely, 2^9991356354 is an apocalyptic number.

9991356354 is an abundant number, since it is smaller than the sum of its proper divisors (15824826558).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

9991356354 is a wasteful number, since it uses less digits than its factorization.

9991356354 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3447711 (or 3447708 counting only the distinct ones).

The product of its digits is 3936600, while the sum is 54.

The square root of 9991356354 is about 99956.7724268846. The cubic root of 9991356354 is about 2153.8137720713.

The spelling of 9991356354 in words is "nine billion, nine hundred ninety-one million, three hundred fifty-six thousand, three hundred fifty-four".