643476143 has 2 divisors, whose sum is σ = 643476144. Its totient is φ = 643476142.

The previous prime is 643476073. The next prime is 643476161. The reversal of 643476143 is 341674346.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 643476143 - 2⁸ = 643475887 is a prime.

It is a super-2 number, since 2×643476143² = 828123093220312898, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 643476097 and 643476106.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (643476443) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321738071 + 321738072.

It is an arithmetic number, because the mean of its divisors is an integer number (321738072).

Almost surely, 2^643476143 is an apocalyptic number.

643476143 is a deficient number, since it is larger than the sum of its proper divisors (1).

643476143 is an equidigital number, since it uses as much as digits as its factorization.

643476143 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 145152, while the sum is 38.

The square root of 643476143 is about 25366.8315522455. The cubic root of 643476143 is about 863.3312936882.

The spelling of 643476143 in words is "six hundred forty-three million, four hundred seventy-six thousand, one hundred forty-three".