646245143 has 2 divisors, whose sum is σ = 646245144. Its totient is φ = 646245142.

The previous prime is 646245101. The next prime is 646245169. The reversal of 646245143 is 341542646.

646245143 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 646245143 - 2²⁸ = 377809687 is a prime.

It is equal to p_33608294 and since 646245143 and 33608294 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (646245343) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323122571 + 323122572.

It is an arithmetic number, because the mean of its divisors is an integer number (323122572).

Almost surely, 2^646245143 is an apocalyptic number.

646245143 is a deficient number, since it is larger than the sum of its proper divisors (1).

646245143 is an equidigital number, since it uses as much as digits as its factorization.

646245143 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 69120, while the sum is 35.

The square root of 646245143 is about 25421.3521080213. The cubic root of 646245143 is about 864.5678811074.

Adding to 646245143 its reverse (341542646), we get a palindrome (987787789).

The spelling of 646245143 in words is "six hundred forty-six million, two hundred forty-five thousand, one hundred forty-three".