809036139 has 4 divisors (see below), whose sum is σ = 1078714856. Its totient is φ = 539357424.

The previous prime is 809036119. The next prime is 809036141. The reversal of 809036139 is 931630908.

809036139 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 809036139 - 2¹² = 809032043 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 809036097 and 809036106.

It is not an unprimeable number, because it can be changed into a prime (809036119) 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, 134839354 + ... + 134839359.

It is an arithmetic number, because the mean of its divisors is an integer number (269678714).

Almost surely, 2^809036139 is an apocalyptic number.

809036139 is a deficient number, since it is larger than the sum of its proper divisors (269678717).

809036139 is a wasteful number, since it uses less digits than its factorization.

809036139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 269678716.

The product of its (nonzero) digits is 34992, while the sum is 39.

The square root of 809036139 is about 28443.5605893496. The cubic root of 809036139 is about 931.7998593218.

The spelling of 809036139 in words is "eight hundred nine million, thirty-six thousand, one hundred thirty-nine".