85011871949 has 4 divisors (see below), whose sum is σ = 85013770236. Its totient is φ = 85009973664.

The previous prime is 85011871921. The next prime is 85011871993. The reversal of 85011871949 is 94917811058.

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 22202490025 + 62809381924 = 149005^2 + 250618^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-85011871949 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 85011871949.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85011871999) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 880304 + ... + 972089.

It is an arithmetic number, because the mean of its divisors is an integer number (21253442559).

Almost surely, 2^85011871949 is an apocalyptic number.

It is an amenable number.

85011871949 is a deficient number, since it is larger than the sum of its proper divisors (1898287).

85011871949 is a wasteful number, since it uses less digits than its factorization.

85011871949 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1898286.

The product of its (nonzero) digits is 725760, while the sum is 53.

The spelling of 85011871949 in words is "eighty-five billion, eleven million, eight hundred seventy-one thousand, nine hundred forty-nine".