618859 has 2 divisors, whose sum is σ = 618860. Its totient is φ = 618858.

The previous prime is 618857. The next prime is 618869. The reversal of 618859 is 958816.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 618859 - 2¹ = 618857 is a prime.

Together with 618857, it forms a pair of twin primes.

It is an Ulam number.

It is not a weakly prime, because it can be changed into another prime (618857) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 309429 + 309430.

It is an arithmetic number, because the mean of its divisors is an integer number (309430).

2⁶¹⁸⁸⁵⁹ is an apocalyptic number.

618859 is a deficient number, since it is larger than the sum of its proper divisors (1).

618859 is an equidigital number, since it uses as much as digits as its factorization.

618859 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 17280, while the sum is 37.

The square root of 618859 is about 786.6759180247. The cubic root of 618859 is about 85.2178494934.

The spelling of 618859 in words is "six hundred eighteen thousand, eight hundred fifty-nine".