999994891 has 10 divisors (see below), whose sum is σ = 1166594092.
Its totient is φ = 857136420.
The previous prime is 999994883. The next prime is 999994903. The reversal of 999994891 is 198499999.
It is not a de Polignac number, because 999994891 - 23 = 999994883 is a prime.
It is a super-2 number, since 2×9999948912 = 1999979564052203762, which contains 22 as substring.
It is a Duffinian number.
It is not an unprimeable number, because it can be changed into a prime (999994861) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (17) of ones.
It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 205845 + ... + 210646.
Almost surely, 2999994891 is an apocalyptic number.
999994891 is a deficient number, since it is larger than the sum of its proper divisors (166599201).
999994891 is an frugal number, since it uses more digits than its factorization.
999994891 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 416519 (or 416498 counting only the distinct ones).
The product of its digits is 17006112, while the sum is 67.
The square root of 999994891 is about 31622.6958211978.
The cubic root of 999994891 is about 999.9982969971.
The spelling of 999994891 in words is "nine hundred ninety-nine million, nine hundred ninety-four thousand, eight hundred ninety-one".