518321369 has 2 divisors, whose sum is σ = 518321370. Its totient is φ = 518321368.

The previous prime is 518321341. The next prime is 518321411. The reversal of 518321369 is 963123815.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 499075600 + 19245769 = 22340^2 + 4387^2 .

It is a cyclic number.

It is not a de Polignac number, because 518321369 - 2¹⁶ = 518255833 is a prime.

It is a super-2 number, since 2×518321369² = 537314083124068322, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (518321329) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 259160684 + 259160685.

It is an arithmetic number, because the mean of its divisors is an integer number (259160685).

Almost surely, 2^518321369 is an apocalyptic number.

It is an amenable number.

518321369 is a deficient number, since it is larger than the sum of its proper divisors (1).

518321369 is an equidigital number, since it uses as much as digits as its factorization.

518321369 is an evil number, because the sum of its binary digits is even.

The product of its digits is 38880, while the sum is 38.

The square root of 518321369 is about 22766.6723304044. The cubic root of 518321369 is about 803.2789221635.

The spelling of 518321369 in words is "five hundred eighteen million, three hundred twenty-one thousand, three hundred sixty-nine".