643115041 has 2 divisors, whose sum is σ = 643115042. Its totient is φ = 643115040.

The previous prime is 643115027. The next prime is 643115051. The reversal of 643115041 is 140511346.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 462078016 + 181037025 = 21496^2 + 13455^2 .

It is a cyclic number.

It is not a de Polignac number, because 643115041 - 2²⁹ = 106244129 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 643114997 and 643115015.

It is not a weakly prime, because it can be changed into another prime (643115051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321557520 + 321557521.

It is an arithmetic number, because the mean of its divisors is an integer number (321557521).

Almost surely, 2^643115041 is an apocalyptic number.

It is an amenable number.

643115041 is a deficient number, since it is larger than the sum of its proper divisors (1).

643115041 is an equidigital number, since it uses as much as digits as its factorization.

643115041 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 643115041 is about 25359.7129518455. The cubic root of 643115041 is about 863.1697704814.

Adding to 643115041 its reverse (140511346), we get a palindrome (783626387).

The spelling of 643115041 in words is "six hundred forty-three million, one hundred fifteen thousand, forty-one".