646379099 has 2 divisors, whose sum is σ = 646379100. Its totient is φ = 646379098.

The previous prime is 646379089. The next prime is 646379113. The reversal of 646379099 is 990973646.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-646379099 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 646379099.

It is not a weakly prime, because it can be changed into another prime (646379009) 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, 323189549 + 323189550.

It is an arithmetic number, because the mean of its divisors is an integer number (323189550).

Almost surely, 2^646379099 is an apocalyptic number.

646379099 is a deficient number, since it is larger than the sum of its proper divisors (1).

646379099 is an equidigital number, since it uses as much as digits as its factorization.

646379099 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2204496, while the sum is 53.

The square root of 646379099 is about 25423.9866858052. The cubic root of 646379099 is about 864.6276138859.

The spelling of 646379099 in words is "six hundred forty-six million, three hundred seventy-nine thousand, ninety-nine".