9991154 has 8 divisors (see below), whose sum is σ = 15638400. Its totient is φ = 4778356.

The previous prime is 9991151. The next prime is 9991159. The reversal of 9991154 is 4511999.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9991151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 108554 + ... + 108645.

It is an arithmetic number, because the mean of its divisors is an integer number (1954800).

Almost surely, 2^9991154 is an apocalyptic number.

9991154 is a deficient number, since it is larger than the sum of its proper divisors (5647246).

9991154 is a wasteful number, since it uses less digits than its factorization.

9991154 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 217224.

The product of its digits is 14580, while the sum is 38.

The square root of 9991154 is about 3160.8786753053. The cubic root of 9991154 is about 215.3799231644.

The spelling of 9991154 in words is "nine million, nine hundred ninety-one thousand, one hundred fifty-four".