985591885 has 16 divisors (see below), whose sum is σ = 1190298096. Its totient is φ = 783433728.

The previous prime is 985591819. The next prime is 985591933. The reversal of 985591885 is 588195589.

985591885 = 386² + 387² + ... + 1444².

It can be written as a sum of positive squares in 8 ways, for example, as 103917636 + 881674249 = 10194^2 + 29693^2 .

It is a cyclic number.

It is not a de Polignac number, because 985591885 - 2⁷ = 985591757 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 593977 + ... + 595633.

It is an arithmetic number, because the mean of its divisors is an integer number (74393631).

Almost surely, 2^985591885 is an apocalyptic number.

It is an amenable number.

985591885 is a deficient number, since it is larger than the sum of its proper divisors (204706211).

985591885 is a wasteful number, since it uses less digits than its factorization.

985591885 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2352.

The product of its digits is 5184000, while the sum is 58.

The square root of 985591885 is about 31394.1377489492. The cubic root of 985591885 is about 995.1740426005.

The spelling of 985591885 in words is "nine hundred eighty-five million, five hundred ninety-one thousand, eight hundred eighty-five".