618869 has 2 divisors, whose sum is σ = 618870. Its totient is φ = 618868.

The previous prime is 618859. The next prime is 618883. The reversal of 618869 is 968816.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 438244 + 180625 = 662^2 + 425^2 .

It is a cyclic number.

It is not a de Polignac number, because 618869 - 2¹² = 614773 is a prime.

It is a super-2 number, since 2×618869² = 765997678322, which contains 22 as substring.

It is a Sophie Germain prime.

It is an Ulam number.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (618859) 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, 309434 + 309435.

It is an arithmetic number, because the mean of its divisors is an integer number (309435).

2⁶¹⁸⁸⁶⁹ is an apocalyptic number.

It is an amenable number.

618869 is a deficient number, since it is larger than the sum of its proper divisors (1).

618869 is an equidigital number, since it uses as much as digits as its factorization.

618869 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20736, while the sum is 38.

The square root of 618869 is about 786.6822738565. The cubic root of 618869 is about 85.2183084961.

The spelling of 618869 in words is "six hundred eighteen thousand, eight hundred sixty-nine".