861601 has 8 divisors (see below), whose sum is σ = 935424. Its totient is φ = 788880.

The previous prime is 861599. The next prime is 861613. The reversal of 861601 is 106168.

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 861601 - 2¹ = 861599 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (861691) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2310 + ... + 2656.

It is an arithmetic number, because the mean of its divisors is an integer number (116928).

2⁸⁶¹⁶⁰¹ is an apocalyptic number.

It is an amenable number.

861601 is a deficient number, since it is larger than the sum of its proper divisors (73823).

861601 is a wasteful number, since it uses less digits than its factorization.

861601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 551.

The product of its (nonzero) digits is 288, while the sum is 22.

The square root of 861601 is about 928.2246495326. The cubic root of 861601 is about 95.1558292017.

Adding to 861601 its reverse (106168), we get a palindrome (967769).

The spelling of 861601 in words is "eight hundred sixty-one thousand, six hundred one".