5645891 has 2 divisors, whose sum is σ = 5645892. Its totient is φ = 5645890.

The previous prime is 5645881. The next prime is 5645903. The reversal of 5645891 is 1985465.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-5645891 is a prime.

It is not a weakly prime, because it can be changed into another prime (5645851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2822945 + 2822946.

It is an arithmetic number, because the mean of its divisors is an integer number (2822946).

Almost surely, 2^5645891 is an apocalyptic number.

5645891 is a deficient number, since it is larger than the sum of its proper divisors (1).

5645891 is an equidigital number, since it uses as much as digits as its factorization.

5645891 is an evil number, because the sum of its binary digits is even.

The product of its digits is 43200, while the sum is 38.

The square root of 5645891 is about 2376.1083729493. The cubic root of 5645891 is about 178.0645622803.

The spelling of 5645891 in words is "five million, six hundred forty-five thousand, eight hundred ninety-one".