861697 has 4 divisors (see below), whose sum is σ = 882756. Its totient is φ = 840640.

The previous prime is 861691. The next prime is 861701. The reversal of 861697 is 796168.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 13456 + 848241 = 116^2 + 921^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-861697 is a prime.

It is a Duffinian number.

861697 is a lucky number.

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

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10468 + ... + 10549.

It is an arithmetic number, because the mean of its divisors is an integer number (220689).

2⁸⁶¹⁶⁹⁷ is an apocalyptic number.

It is an amenable number.

861697 is a deficient number, since it is larger than the sum of its proper divisors (21059).

861697 is a wasteful number, since it uses less digits than its factorization.

861697 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21058.

The product of its digits is 18144, while the sum is 37.

The square root of 861697 is about 928.2763597119. The cubic root of 861697 is about 95.1593631732.

The spelling of 861697 in words is "eight hundred sixty-one thousand, six hundred ninety-seven".