99999291 has 16 divisors (see below), whose sum is σ = 153152000.
Its totient is φ = 56852928.
The previous prime is 99999259. The next prime is 99999307. The reversal of 99999291 is 19299999.
It is not a de Polignac number, because 99999291 - 25 = 99999259 is a prime.
It is a Duffinian number.
It is not an unprimeable number, because it can be changed into a prime (99998291) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (19) of ones.
It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7786 + ... + 16143.
It is an arithmetic number, because the mean of its divisors is an integer number (9572000).
Almost surely, 299999291 is an apocalyptic number.
99999291 is a deficient number, since it is larger than the sum of its proper divisors (53152709).
99999291 is a wasteful number, since it uses less digits than its factorization.
99999291 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 24138.
The product of its digits is 1062882, while the sum is 57.
The square root of 99999291 is about 9999.9645499372.
The cubic root of 99999291 is about 464.1577863965.
The spelling of 99999291 in words is "ninety-nine million, nine hundred ninety-nine thousand, two hundred ninety-one".