5636861 has 4 divisors (see below), whose sum is σ = 5641692. Its totient is φ = 5632032.

The previous prime is 5636849. The next prime is 5636893. The reversal of 5636861 is 1686365.

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 2464900 + 3171961 = 1570^2 + 1781^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-5636861 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 (5636821) 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, 545 + ... + 3401.

It is an arithmetic number, because the mean of its divisors is an integer number (1410423).

Almost surely, 2^5636861 is an apocalyptic number.

It is an amenable number.

5636861 is a deficient number, since it is larger than the sum of its proper divisors (4831).

5636861 is a wasteful number, since it uses less digits than its factorization.

5636861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4830.

The product of its digits is 25920, while the sum is 35.

The square root of 5636861 is about 2374.2074467072. The cubic root of 5636861 is about 177.9695798707.

The spelling of 5636861 in words is "five million, six hundred thirty-six thousand, eight hundred sixty-one".