99999289 has 4 divisors (see below), whose sum is σ = 107691556. Its totient is φ = 92307024.

The previous prime is 99999259. The next prime is 99999307. The reversal of 99999289 is 98299999.

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

It can be written as a sum of positive squares in 2 ways, for example, as 58782889 + 41216400 = 7667^2 + 6420^2 .

It is a cyclic number.

It is not a de Polignac number, because 99999289 - 2⁵ = 99999257 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 99999289.

It is not an unprimeable number, because it can be changed into a prime (99999259) 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, 3846114 + ... + 3846139.

It is an arithmetic number, because the mean of its divisors is an integer number (26922889).

Almost surely, 2^99999289 is an apocalyptic number.

It is an amenable number.

99999289 is a deficient number, since it is larger than the sum of its proper divisors (7692267).

99999289 is a wasteful number, since it uses less digits than its factorization.

99999289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7692266.

The product of its digits is 8503056, while the sum is 64.

The square root of 99999289 is about 9999.9644499368. The cubic root of 99999289 is about 464.1577833021.

The spelling of 99999289 in words is "ninety-nine million, nine hundred ninety-nine thousand, two hundred eighty-nine".