643432301 has 2 divisors, whose sum is σ = 643432302. Its totient is φ = 643432300.

The previous prime is 643432267. The next prime is 643432313. The reversal of 643432301 is 103234346.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 610139401 + 33292900 = 24701^2 + 5770^2 .

It is a cyclic number.

It is not a de Polignac number, because 643432301 - 2²⁶ = 576323437 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (643431301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321716150 + 321716151.

It is an arithmetic number, because the mean of its divisors is an integer number (321716151).

Almost surely, 2^643432301 is an apocalyptic number.

It is an amenable number.

643432301 is a deficient number, since it is larger than the sum of its proper divisors (1).

643432301 is an equidigital number, since it uses as much as digits as its factorization.

643432301 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5184, while the sum is 26.

The square root of 643432301 is about 25365.9673775711. The cubic root of 643432301 is about 863.3116861080.

Adding to 643432301 its reverse (103234346), we get a palindrome (746666647).

The spelling of 643432301 in words is "six hundred forty-three million, four hundred thirty-two thousand, three hundred one".