83605861 has 4 divisors (see below), whose sum is σ = 83663500. Its totient is φ = 83548224.

The previous prime is 83605849. The next prime is 83605867. The reversal of 83605861 is 16850638.

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 41602500 + 42003361 = 6450^2 + 6481^2 .

It is a cyclic number.

It is not a de Polignac number, because 83605861 - 2¹¹ = 83603813 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 83605861.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (83605867) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26586 + ... + 29563.

It is an arithmetic number, because the mean of its divisors is an integer number (20915875).

Almost surely, 2^83605861 is an apocalyptic number.

It is an amenable number.

83605861 is a deficient number, since it is larger than the sum of its proper divisors (57639).

83605861 is a wasteful number, since it uses less digits than its factorization.

83605861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57638.

The product of its (nonzero) digits is 34560, while the sum is 37.

The square root of 83605861 is about 9143.6240627007. The cubic root of 83605861 is about 437.2658639447.

The spelling of 83605861 in words is "eighty-three million, six hundred five thousand, eight hundred sixty-one".