643346051 has 2 divisors, whose sum is σ = 643346052. Its totient is φ = 643346050.

The previous prime is 643346027. The next prime is 643346083. The reversal of 643346051 is 150643346.

It is an a-pointer prime, because the next prime (643346083) can be obtained adding 643346051 to its sum of digits (32).

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-643346051 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 643345999 and 643346017.

It is not a weakly prime, because it can be changed into another prime (643346021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321673025 + 321673026.

It is an arithmetic number, because the mean of its divisors is an integer number (321673026).

Almost surely, 2^643346051 is an apocalyptic number.

643346051 is a deficient number, since it is larger than the sum of its proper divisors (1).

643346051 is an equidigital number, since it uses as much as digits as its factorization.

643346051 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 25920, while the sum is 32.

The square root of 643346051 is about 25364.2672080232. The cubic root of 643346051 is about 863.2731096796.

Adding to 643346051 its reverse (150643346), we get a palindrome (793989397).

The spelling of 643346051 in words is "six hundred forty-three million, three hundred forty-six thousand, fifty-one".