618861 has 8 divisors (see below), whose sum is σ = 861120. Its totient is φ = 394592.

The previous prime is 618859. The next prime is 618869. The reversal of 618861 is 168816.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 618861 - 2¹ = 618859 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (618869) 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 in 7 ways as a sum of consecutive naturals, for example, 4416 + ... + 4553.

It is an arithmetic number, because the mean of its divisors is an integer number (107640).

2⁶¹⁸⁸⁶¹ is an apocalyptic number.

It is an amenable number.

618861 is a deficient number, since it is larger than the sum of its proper divisors (242259).

618861 is a wasteful number, since it uses less digits than its factorization.

618861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8995.

The product of its digits is 2304, while the sum is 30.

The square root of 618861 is about 786.6771891952. The cubic root of 618861 is about 85.2179412943.

The spelling of 618861 in words is "six hundred eighteen thousand, eight hundred sixty-one".