79499009 has 4 divisors (see below), whose sum is σ = 79525716. Its totient is φ = 79472304.

The previous prime is 79498999. The next prime is 79499023. The reversal of 79499009 is 90099497.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 90099497 = 71 ⋅1269007.

It can be written as a sum of positive squares in 2 ways, for example, as 37210000 + 42289009 = 6100^2 + 6503^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-79499009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (79499029) 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, 8234 + ... + 15059.

It is an arithmetic number, because the mean of its divisors is an integer number (19881429).

Almost surely, 2^79499009 is an apocalyptic number.

It is an amenable number.

79499009 is a deficient number, since it is larger than the sum of its proper divisors (26707).

79499009 is a wasteful number, since it uses less digits than its factorization.

79499009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26706.

The product of its (nonzero) digits is 183708, while the sum is 47.

The square root of 79499009 is about 8916.2216773698. The cubic root of 79499009 is about 429.9855935321.

The spelling of 79499009 in words is "seventy-nine million, four hundred ninety-nine thousand, nine".