643270051 has 2 divisors, whose sum is σ = 643270052. Its totient is φ = 643270050.

The previous prime is 643270027. The next prime is 643270109. The reversal of 643270051 is 150072346.

643270051 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-643270051 is a prime.

It is equal to p_33461713 and since 643270051 and 33461713 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (643270751) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321635025 + 321635026.

It is an arithmetic number, because the mean of its divisors is an integer number (321635026).

Almost surely, 2^643270051 is an apocalyptic number.

643270051 is a deficient number, since it is larger than the sum of its proper divisors (1).

643270051 is an equidigital number, since it uses as much as digits as its factorization.

643270051 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5040, while the sum is 28.

The square root of 643270051 is about 25362.7689931521. The cubic root of 643270051 is about 863.2391148387.

The spelling of 643270051 in words is "six hundred forty-three million, two hundred seventy thousand, fifty-one".