681169 has 4 divisors (see below), whose sum is σ = 717040. Its totient is φ = 645300.

The previous prime is 681167. The next prime is 681179. The reversal of 681169 is 961186.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 681169 - 2¹ = 681167 is a prime.

It is a super-2 number, since 2×681169² = 927982413122, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 681169.

It is not an unprimeable number, because it can be changed into a prime (681167) 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, 17907 + ... + 17944.

It is an arithmetic number, because the mean of its divisors is an integer number (179260).

2⁶⁸¹¹⁶⁹ is an apocalyptic number.

It is an amenable number.

681169 is a deficient number, since it is larger than the sum of its proper divisors (35871).

681169 is a wasteful number, since it uses less digits than its factorization.

681169 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35870.

The product of its digits is 2592, while the sum is 31.

The square root of 681169 is about 825.3296311172. The cubic root of 681169 is about 87.9869557112.

The spelling of 681169 in words is "six hundred eighty-one thousand, one hundred sixty-nine".