5645671 has 2 divisors, whose sum is σ = 5645672. Its totient is φ = 5645670.

The previous prime is 5645657. The next prime is 5645677. The reversal of 5645671 is 1765465.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 5645671 - 2⁵ = 5645639 is a prime.

5645671 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (5645677) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2822835 + 2822836.

It is an arithmetic number, because the mean of its divisors is an integer number (2822836).

Almost surely, 2^5645671 is an apocalyptic number.

5645671 is a deficient number, since it is larger than the sum of its proper divisors (1).

5645671 is an equidigital number, since it uses as much as digits as its factorization.

5645671 is an evil number, because the sum of its binary digits is even.

The product of its digits is 25200, while the sum is 34.

The square root of 5645671 is about 2376.0620783136. The cubic root of 5645671 is about 178.0622494057.

The spelling of 5645671 in words is "five million, six hundred forty-five thousand, six hundred seventy-one".