671751 has 12 divisors (see below), whose sum is σ = 981240. Its totient is φ = 442800.

The previous prime is 671743. The next prime is 671753. The reversal of 671751 is 157176.

It is not a de Polignac number, because 671751 - 2³ = 671743 is a prime.

It is a Smith number, since the sum of its digits (27) coincides with the sum of the digits of its prime factors.

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 671751.

It is not an unprimeable number, because it can be changed into a prime (671753) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 540 + ... + 1278.

It is an arithmetic number, because the mean of its divisors is an integer number (81770).

2⁶⁷¹⁷⁵¹ is an apocalyptic number.

671751 is a deficient number, since it is larger than the sum of its proper divisors (309489).

671751 is a wasteful number, since it uses less digits than its factorization.

671751 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 846 (or 843 counting only the distinct ones).

The product of its digits is 1470, while the sum is 27.

The square root of 671751 is about 819.6041727566. The cubic root of 671751 is about 87.5795630063.

It can be divided in two parts, 67175 and 1, that added together give a palindrome (67176).

The spelling of 671751 in words is "six hundred seventy-one thousand, seven hundred fifty-one".