671773 has 4 divisors (see below), whose sum is σ = 673948. Its totient is φ = 669600.

The previous prime is 671753. The next prime is 671777. The reversal of 671773 is 377176.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 213444 + 458329 = 462^2 + 677^2 .

It is a cyclic number.

It is not a de Polignac number, because 671773 - 2⁹ = 671261 is a prime.

It is a Duffinian number.

671773 is a lucky number.

It is a plaindrome in base 9.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (671777) 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 3 ways as a sum of consecutive naturals, for example, 528 + ... + 1273.

It is an arithmetic number, because the mean of its divisors is an integer number (168487).

2⁶⁷¹⁷⁷³ is an apocalyptic number.

It is an amenable number.

671773 is a deficient number, since it is larger than the sum of its proper divisors (2175).

671773 is a wasteful number, since it uses less digits than its factorization.

671773 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2174.

The product of its digits is 6174, while the sum is 31.

The square root of 671773 is about 819.6175937594. The cubic root of 671773 is about 87.5805190794.

It can be divided in two parts, 671 and 773, that added together give a square (1444 = 38²).

The spelling of 671773 in words is "six hundred seventy-one thousand, seven hundred seventy-three".