85082090809 has 4 divisors (see below), whose sum is σ = 85323116916. Its totient is φ = 84841064704.

The previous prime is 85082090803. The next prime is 85082090831. The reversal of 85082090809 is 90809028058.

It is a happy number.

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 21600768784 + 63481322025 = 146972^2 + 251955^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-85082090809 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (85082090803) 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, 120512524 + ... + 120513229.

It is an arithmetic number, because the mean of its divisors is an integer number (21330779229).

Almost surely, 2^85082090809 is an apocalyptic number.

It is an amenable number.

85082090809 is a deficient number, since it is larger than the sum of its proper divisors (241026107).

85082090809 is a wasteful number, since it uses less digits than its factorization.

85082090809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 241026106.

The product of its (nonzero) digits is 414720, while the sum is 49.

The spelling of 85082090809 in words is "eighty-five billion, eighty-two million, ninety thousand, eight hundred nine".