518761 has 2 divisors, whose sum is σ = 518762. Its totient is φ = 518760.

The previous prime is 518759. The next prime is 518767. The reversal of 518761 is 167815.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 518400 + 361 = 720^2 + 19^2 .

It is a cyclic number.

It is not a de Polignac number, because 518761 - 2¹ = 518759 is a prime.

It is a super-2 number, since 2×518761² = 538225950242, which contains 22 as substring.

Together with 518759, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (518767) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 259380 + 259381.

It is an arithmetic number, because the mean of its divisors is an integer number (259381).

2⁵¹⁸⁷⁶¹ is an apocalyptic number.

It is an amenable number.

518761 is a deficient number, since it is larger than the sum of its proper divisors (1).

518761 is an equidigital number, since it uses as much as digits as its factorization.

518761 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1680, while the sum is 28.

The square root of 518761 is about 720.2506508154. The cubic root of 518761 is about 80.3505966966.

The spelling of 518761 in words is "five hundred eighteen thousand, seven hundred sixty-one".