860661 has 6 divisors (see below), whose sum is σ = 1243190. Its totient is φ = 573768.

The previous prime is 860647. The next prime is 860663. The reversal of 860661 is 166068.

It can be written as a sum of positive squares in only one way, i.e., 463761 + 396900 = 681^2 + 630^2 .

It is not a de Polignac number, because 860661 - 2⁷ = 860533 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (860663) 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, 47806 + ... + 47823.

2⁸⁶⁰⁶⁶¹ is an apocalyptic number.

It is an amenable number.

860661 is a deficient number, since it is larger than the sum of its proper divisors (382529).

860661 is a wasteful number, since it uses less digits than its factorization.

860661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95635 (or 95632 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 860661 is about 927.7181684111. The cubic root of 860661 is about 95.1212118526.

It can be divided in two parts, 860 and 661, that added together give a square (1521 = 39²).

The spelling of 860661 in words is "eight hundred sixty thousand, six hundred sixty-one".