5645861 has 4 divisors (see below), whose sum is σ = 6080172. Its totient is φ = 5211552.

The previous prime is 5645851. The next prime is 5645881. The reversal of 5645861 is 1685465.

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 3876961 + 1768900 = 1969^2 + 1330^2 .

It is a cyclic number.

It is not a de Polignac number, because 5645861 - 2²² = 1451557 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 (5645851) 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, 217136 + ... + 217161.

It is an arithmetic number, because the mean of its divisors is an integer number (1520043).

Almost surely, 2^5645861 is an apocalyptic number.

It is an amenable number.

5645861 is a deficient number, since it is larger than the sum of its proper divisors (434311).

5645861 is a wasteful number, since it uses less digits than its factorization.

5645861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 434310.

The product of its digits is 28800, while the sum is 35.

The square root of 5645861 is about 2376.1020600976. The cubic root of 5645861 is about 178.0642468918.

The spelling of 5645861 in words is "five million, six hundred forty-five thousand, eight hundred sixty-one".