9999491 has 4 divisors (see below), whose sum is σ = 10525800. Its totient is φ = 9473184.

The previous prime is 9999481. The next prime is 9999511. The reversal of 9999491 is 1949999.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 9999491 - 2¹⁴ = 9983107 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9999401) 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, 263126 + ... + 263163.

It is an arithmetic number, because the mean of its divisors is an integer number (2631450).

Almost surely, 2^9999491 is an apocalyptic number.

9999491 is a deficient number, since it is larger than the sum of its proper divisors (526309).

9999491 is a wasteful number, since it uses less digits than its factorization.

9999491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 526308.

The product of its digits is 236196, while the sum is 50.

The square root of 9999491 is about 3162.1971791778. The cubic root of 9999491 is about 215.4398135836.

The spelling of 9999491 in words is "nine million, nine hundred ninety-nine thousand, four hundred ninety-one".