518447389 has 2 divisors, whose sum is σ = 518447390. Its totient is φ = 518447388.

The previous prime is 518447381. The next prime is 518447399. The reversal of 518447389 is 983744815.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 479172100 + 39275289 = 21890^2 + 6267^2 .

It is a cyclic number.

It is not a de Polignac number, because 518447389 - 2³ = 518447381 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (518447381) 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, 259223694 + 259223695.

It is an arithmetic number, because the mean of its divisors is an integer number (259223695).

Almost surely, 2^518447389 is an apocalyptic number.

It is an amenable number.

518447389 is a deficient number, since it is larger than the sum of its proper divisors (1).

518447389 is an equidigital number, since it uses as much as digits as its factorization.

518447389 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 967680, while the sum is 49.

The square root of 518447389 is about 22769.4398042640. The cubic root of 518447389 is about 803.3440175611.

The spelling of 518447389 in words is "five hundred eighteen million, four hundred forty-seven thousand, three hundred eighty-nine".