5645551 has 2 divisors, whose sum is σ = 5645552. Its totient is φ = 5645550.

The previous prime is 5645539. The next prime is 5645569. The reversal of 5645551 is 1555465.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 5645551 - 2¹¹ = 5643503 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (5645501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2822775 + 2822776.

It is an arithmetic number, because the mean of its divisors is an integer number (2822776).

Almost surely, 2^5645551 is an apocalyptic number.

5645551 is a deficient number, since it is larger than the sum of its proper divisors (1).

5645551 is an equidigital number, since it uses as much as digits as its factorization.

5645551 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15000, while the sum is 31.

The square root of 5645551 is about 2376.0368263139. The cubic root of 5645551 is about 178.0609878125.

The spelling of 5645551 in words is "five million, six hundred forty-five thousand, five hundred fifty-one".