518921069 has 2 divisors, whose sum is σ = 518921070. Its totient is φ = 518921068.

The previous prime is 518921047. The next prime is 518921089. The reversal of 518921069 is 960129815.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 473628169 + 45292900 = 21763^2 + 6730^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-518921069 is a prime.

It is a super-2 number, since 2×518921069² = 538558151704205522, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is equal to p_27298832 and since 518921069 and 27298832 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (518921089) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 259460534 + 259460535.

It is an arithmetic number, because the mean of its divisors is an integer number (259460535).

Almost surely, 2^518921069 is an apocalyptic number.

It is an amenable number.

518921069 is a deficient number, since it is larger than the sum of its proper divisors (1).

518921069 is an equidigital number, since it uses as much as digits as its factorization.

518921069 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 38880, while the sum is 41.

The square root of 518921069 is about 22779.8390907399. The cubic root of 518921069 is about 803.5886017891.

The spelling of 518921069 in words is "five hundred eighteen million, nine hundred twenty-one thousand, sixty-nine".