312681 has 8 divisors (see below), whose sum is σ = 441504. Its totient is φ = 196160.

The previous prime is 312679. The next prime is 312701. The reversal of 312681 is 186213.

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 312681 - 2¹ = 312679 is a prime.

It is a super-2 number, since 2×312681² = 195538815522, which contains 22 as substring.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 312681.

It is not an unprimeable number, because it can be changed into a prime (312601) 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, 3015 + ... + 3116.

It is an arithmetic number, because the mean of its divisors is an integer number (55188).

2³¹²⁶⁸¹ is an apocalyptic number.

It is an amenable number.

312681 is a deficient number, since it is larger than the sum of its proper divisors (128823).

312681 is a wasteful number, since it uses less digits than its factorization.

312681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6151.

The product of its digits is 288, while the sum is 21.

The square root of 312681 is about 559.1788622614. The cubic root of 312681 is about 67.8735394752.

Adding to 312681 its reverse (186213), we get a palindrome (498894).

The spelling of 312681 in words is "three hundred twelve thousand, six hundred eighty-one".