643131341 has 2 divisors, whose sum is σ = 643131342. Its totient is φ = 643131340.

The previous prime is 643131319. The next prime is 643131343. The reversal of 643131341 is 143131346.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 439070116 + 204061225 = 20954^2 + 14285^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-643131341 is a prime.

Together with 643131343, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 643131341.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (643131343) 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, 321565670 + 321565671.

It is an arithmetic number, because the mean of its divisors is an integer number (321565671).

Almost surely, 2^643131341 is an apocalyptic number.

It is an amenable number.

643131341 is a deficient number, since it is larger than the sum of its proper divisors (1).

643131341 is an equidigital number, since it uses as much as digits as its factorization.

643131341 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2592, while the sum is 26.

The square root of 643131341 is about 25360.0343256865. The cubic root of 643131341 is about 863.1770628772.

Adding to 643131341 its reverse (143131346), we get a palindrome (786262687).

The spelling of 643131341 in words is "six hundred forty-three million, one hundred thirty-one thousand, three hundred forty-one".