643280227 has 2 divisors, whose sum is σ = 643280228. Its totient is φ = 643280226.

The previous prime is 643280179. The next prime is 643280243. The reversal of 643280227 is 722082346.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 643280227 - 2²³ = 634891619 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 643280192 and 643280201.

It is not a weakly prime, because it can be changed into another prime (643200227) 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, 321640113 + 321640114.

It is an arithmetic number, because the mean of its divisors is an integer number (321640114).

Almost surely, 2^643280227 is an apocalyptic number.

643280227 is a deficient number, since it is larger than the sum of its proper divisors (1).

643280227 is an equidigital number, since it uses as much as digits as its factorization.

643280227 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32256, while the sum is 34.

The square root of 643280227 is about 25362.9696013696. The cubic root of 643280227 is about 863.2436667242.

The spelling of 643280227 in words is "six hundred forty-three million, two hundred eighty thousand, two hundred twenty-seven".