518866987 has 2 divisors, whose sum is σ = 518866988. Its totient is φ = 518866986.

The previous prime is 518866973. The next prime is 518867003. The reversal of 518866987 is 789668815.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-518866987 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (518866937) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 259433493 + 259433494.

It is an arithmetic number, because the mean of its divisors is an integer number (259433494).

Almost surely, 2^518866987 is an apocalyptic number.

518866987 is a deficient number, since it is larger than the sum of its proper divisors (1).

518866987 is an equidigital number, since it uses as much as digits as its factorization.

518866987 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5806080, while the sum is 58.

The square root of 518866987 is about 22778.6520013806. The cubic root of 518866987 is about 803.5606841273.

The spelling of 518866987 in words is "five hundred eighteen million, eight hundred sixty-six thousand, nine hundred eighty-seven".