85239820349 has 4 divisors (see below), whose sum is σ = 85240717980. Its totient is φ = 85238922720.

The previous prime is 85239820339. The next prime is 85239820417. The reversal of 85239820349 is 94302893258.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 76420732249 + 8819088100 = 276443^2 + 93910^2 .

It is a cyclic number.

It is not a de Polignac number, because 85239820349 - 2¹² = 85239816253 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 85239820349.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85239820339) 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, 286904 + ... + 502785.

It is an arithmetic number, because the mean of its divisors is an integer number (21310179495).

Almost surely, 2^85239820349 is an apocalyptic number.

It is an amenable number.

85239820349 is a deficient number, since it is larger than the sum of its proper divisors (897631).

85239820349 is a wasteful number, since it uses less digits than its factorization.

85239820349 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 897630.

The product of its (nonzero) digits is 3732480, while the sum is 53.

The spelling of 85239820349 in words is "eighty-five billion, two hundred thirty-nine million, eight hundred twenty thousand, three hundred forty-nine".