999109079 has 4 divisors (see below), whose sum is σ = 1006401984. Its totient is φ = 991816176.

The previous prime is 999109061. The next prime is 999109087. The reversal of 999109079 is 970901999.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-999109079 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 999109079.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (999109019) 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, 3646247 + ... + 3646520.

It is an arithmetic number, because the mean of its divisors is an integer number (251600496).

Almost surely, 2^999109079 is an apocalyptic number.

999109079 is a deficient number, since it is larger than the sum of its proper divisors (7292905).

999109079 is a wasteful number, since it uses less digits than its factorization.

999109079 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7292904.

The product of its (nonzero) digits is 413343, while the sum is 53.

The square root of 999109079 is about 31608.6867648753. The cubic root of 999109079 is about 999.7029380963.

The spelling of 999109079 in words is "nine hundred ninety-nine million, one hundred nine thousand, seventy-nine".