516820439 has 2 divisors, whose sum is σ = 516820440. Its totient is φ = 516820438.

The previous prime is 516820433. The next prime is 516820453. The reversal of 516820439 is 934028615.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 516820439 - 2²⁰ = 515771863 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (516820433) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 258410219 + 258410220.

It is an arithmetic number, because the mean of its divisors is an integer number (258410220).

Almost surely, 2^516820439 is an apocalyptic number.

516820439 is a deficient number, since it is larger than the sum of its proper divisors (1).

516820439 is an equidigital number, since it uses as much as digits as its factorization.

516820439 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 51840, while the sum is 38.

The square root of 516820439 is about 22733.6851170240. The cubic root of 516820439 is about 802.5028070929.

The spelling of 516820439 in words is "five hundred sixteen million, eight hundred twenty thousand, four hundred thirty-nine".