682991 has 4 divisors (see below), whose sum is σ = 685800. Its totient is φ = 680184.

The previous prime is 682967. The next prime is 683003. The reversal of 682991 is 199286.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 199286 = 2 ⋅99643.

It is a cyclic number.

It is not a de Polignac number, because 682991 - 2¹⁴ = 666607 is a prime.

It is a Duffinian number.

It is a plaindrome in base 6.

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 682991.

It is not an unprimeable number, because it can be changed into a prime (682901) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1001 + ... + 1538.

It is an arithmetic number, because the mean of its divisors is an integer number (171450).

2⁶⁸²⁹⁹¹ is an apocalyptic number.

682991 is a deficient number, since it is larger than the sum of its proper divisors (2809).

682991 is a wasteful number, since it uses less digits than its factorization.

682991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2808.

The product of its digits is 7776, while the sum is 35.

The square root of 682991 is about 826.4326953842. The cubic root of 682991 is about 88.0653354330.

The spelling of 682991 in words is "six hundred eighty-two thousand, nine hundred ninety-one".