660831 has 8 divisors (see below), whose sum is σ = 886704. Its totient is φ = 437760.

The previous prime is 660817. The next prime is 660833. The reversal of 660831 is 138066.

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

It is not a de Polignac number, because 660831 - 2⁵ = 660799 is a prime.

It is a super-2 number, since 2×660831² = 873395221122, which contains 22 as substring.

It is a Smith number, since the sum of its digits (24) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (660833) 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, 66 + ... + 1151.

It is an arithmetic number, because the mean of its divisors is an integer number (110838).

2⁶⁶⁰⁸³¹ is an apocalyptic number.

660831 is a deficient number, since it is larger than the sum of its proper divisors (225873).

660831 is a wasteful number, since it uses less digits than its factorization.

660831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1401.

The product of its (nonzero) digits is 864, while the sum is 24.

The square root of 660831 is about 812.9151247209. The cubic root of 660831 is about 87.1024028709.

Adding to 660831 its reverse (138066), we get a palindrome (798897).

The spelling of 660831 in words is "six hundred sixty thousand, eight hundred thirty-one".