681473 has 16 divisors (see below), whose sum is σ = 806400. Its totient is φ = 570240.

The previous prime is 681451. The next prime is 681481. The reversal of 681473 is 374186.

It is a Cunningham number, because it is equal to 88³+1.

It is a cyclic number.

It is not a de Polignac number, because 681473 - 2⁶ = 681409 is a prime.

It is a Duffinian number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 681473.

It is not an unprimeable number, because it can be changed into a prime (681403) 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 15 ways as a sum of consecutive naturals, for example, 7613 + ... + 7701.

It is an arithmetic number, because the mean of its divisors is an integer number (50400).

681473 is a Friedman number, since it can be written as (8*(7+4))^3+1^6, using all its digits and the basic arithmetic operations.

2⁶⁸¹⁴⁷³ is an apocalyptic number.

It is an amenable number.

681473 is a deficient number, since it is larger than the sum of its proper divisors (124927).

681473 is a wasteful number, since it uses less digits than its factorization.

681473 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 152.

The product of its digits is 4032, while the sum is 29.

The square root of 681473 is about 825.5137794126. The cubic root of 681473 is about 88.0000430441. Note that the first 4 decimals are identical.

The spelling of 681473 in words is "six hundred eighty-one thousand, four hundred seventy-three".