518261 has 2 divisors, whose sum is σ = 518262. Its totient is φ = 518260.

The previous prime is 518249. The next prime is 518291. The reversal of 518261 is 162815.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 504100 + 14161 = 710^2 + 119^2 .

It is a cyclic number.

It is not a de Polignac number, because 518261 - 2¹⁸ = 256117 is a prime.

It is a Chen prime.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 518261.

It is not a weakly prime, because it can be changed into another prime (518291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 259130 + 259131.

It is an arithmetic number, because the mean of its divisors is an integer number (259131).

2⁵¹⁸²⁶¹ is an apocalyptic number.

It is an amenable number.

518261 is a deficient number, since it is larger than the sum of its proper divisors (1).

518261 is an equidigital number, since it uses as much as digits as its factorization.

518261 is an evil number, because the sum of its binary digits is even.

The product of its digits is 480, while the sum is 23.

The square root of 518261 is about 719.9034657508. The cubic root of 518261 is about 80.3247734930.

The spelling of 518261 in words is "five hundred eighteen thousand, two hundred sixty-one".