518993477 has 2 divisors, whose sum is σ = 518993478. Its totient is φ = 518993476.

The previous prime is 518993407. The next prime is 518993479. The reversal of 518993477 is 774399815.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 429898756 + 89094721 = 20734^2 + 9439^2 .

It is a cyclic number.

It is not a de Polignac number, because 518993477 - 2¹⁴ = 518977093 is a prime.

Together with 518993479, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (518993479) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 259496738 + 259496739.

It is an arithmetic number, because the mean of its divisors is an integer number (259496739).

Almost surely, 2^518993477 is an apocalyptic number.

It is an amenable number.

518993477 is a deficient number, since it is larger than the sum of its proper divisors (1).

518993477 is an equidigital number, since it uses as much as digits as its factorization.

518993477 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1905120, while the sum is 53.

The square root of 518993477 is about 22781.4283353788. The cubic root of 518993477 is about 803.6259764759.

The spelling of 518993477 in words is "five hundred eighteen million, nine hundred ninety-three thousand, four hundred seventy-seven".