616861 has 6 divisors (see below), whose sum is σ = 717630. Its totient is φ = 528696.

The previous prime is 616849. The next prime is 616871. The reversal of 616861 is 168616.

It can be written as a sum of positive squares in only one way, i.e., 396900 + 219961 = 630^2 + 469^2 .

It is not a de Polignac number, because 616861 - 2⁵ = 616829 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (616841) 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 5 ways as a sum of consecutive naturals, for example, 6246 + ... + 6343.

It is an arithmetic number, because the mean of its divisors is an integer number (119605).

2⁶¹⁶⁸⁶¹ is an apocalyptic number.

It is an amenable number.

616861 is a deficient number, since it is larger than the sum of its proper divisors (100769).

616861 is a wasteful number, since it uses less digits than its factorization.

616861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12603 (or 12596 counting only the distinct ones).

The product of its digits is 1728, while the sum is 28.

The square root of 616861 is about 785.4049910715. The cubic root of 616861 is about 85.1260413821.

The spelling of 616861 in words is "six hundred sixteen thousand, eight hundred sixty-one".