85123913209 has 4 divisors (see below), whose sum is σ = 85134163840. Its totient is φ = 85113662580.

The previous prime is 85123913197. The next prime is 85123913213. The reversal of 85123913209 is 90231932158.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 85123913209 - 2⁷ = 85123913081 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (85123913299) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5112849 + ... + 5129470.

It is an arithmetic number, because the mean of its divisors is an integer number (21283540960).

Almost surely, 2^85123913209 is an apocalyptic number.

It is an amenable number.

85123913209 is a deficient number, since it is larger than the sum of its proper divisors (10250631).

85123913209 is a wasteful number, since it uses less digits than its factorization.

85123913209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10250630.

The product of its (nonzero) digits is 116640, while the sum is 43.

The spelling of 85123913209 in words is "eighty-five billion, one hundred twenty-three million, nine hundred thirteen thousand, two hundred nine".