518193649 has 2 divisors, whose sum is σ = 518193650. Its totient is φ = 518193648.

The previous prime is 518193623. The next prime is 518193653. The reversal of 518193649 is 946391815.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 287913024 + 230280625 = 16968^2 + 15175^2 .

It is a cyclic number.

It is not a de Polignac number, because 518193649 - 2¹⁷ = 518062577 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 518193599 and 518193608.

It is not a weakly prime, because it can be changed into another prime (518193679) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 259096824 + 259096825.

It is an arithmetic number, because the mean of its divisors is an integer number (259096825).

Almost surely, 2^518193649 is an apocalyptic number.

It is an amenable number.

518193649 is a deficient number, since it is larger than the sum of its proper divisors (1).

518193649 is an equidigital number, since it uses as much as digits as its factorization.

518193649 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 233280, while the sum is 46.

The square root of 518193649 is about 22763.8671802486. The cubic root of 518193649 is about 803.2129378675.

The spelling of 518193649 in words is "five hundred eighteen million, one hundred ninety-three thousand, six hundred forty-nine".