518255797 has 2 divisors, whose sum is σ = 518255798. Its totient is φ = 518255796.

The previous prime is 518255789. The next prime is 518255807. The reversal of 518255797 is 797552815.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 290668401 + 227587396 = 17049^2 + 15086^2 .

It is a cyclic number.

It is not a de Polignac number, because 518255797 - 2³ = 518255789 is a prime.

It is a super-2 number, since 2×518255797² = 537178142248210418, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 518255797.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (518255197) 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, 259127898 + 259127899.

It is an arithmetic number, because the mean of its divisors is an integer number (259127899).

Almost surely, 2^518255797 is an apocalyptic number.

It is an amenable number.

518255797 is a deficient number, since it is larger than the sum of its proper divisors (1).

518255797 is an equidigital number, since it uses as much as digits as its factorization.

518255797 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 882000, while the sum is 49.

The square root of 518255797 is about 22765.2321973662. The cubic root of 518255797 is about 803.2450468949.

The spelling of 518255797 in words is "five hundred eighteen million, two hundred fifty-five thousand, seven hundred ninety-seven".