84385131709 has 4 divisors (see below), whose sum is σ = 89348963004. Its totient is φ = 79421300416.

The previous prime is 84385131697. The next prime is 84385131731. The reversal of 84385131709 is 90713158348.

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 78300351684 + 6084780025 = 279822^2 + 78005^2 .

It is a cyclic number.

It is not a de Polignac number, because 84385131709 - 2²¹ = 84383034557 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (84385131749) 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, 2481915622 + ... + 2481915655.

It is an arithmetic number, because the mean of its divisors is an integer number (22337240751).

Almost surely, 2^84385131709 is an apocalyptic number.

It is an amenable number.

84385131709 is a deficient number, since it is larger than the sum of its proper divisors (4963831295).

84385131709 is a wasteful number, since it uses less digits than its factorization.

84385131709 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4963831294.

The product of its (nonzero) digits is 725760, while the sum is 49.

The spelling of 84385131709 in words is "eighty-four billion, three hundred eighty-five million, one hundred thirty-one thousand, seven hundred nine".