671529 has 4 divisors (see below), whose sum is σ = 895376. Its totient is φ = 447684.

The previous prime is 671519. The next prime is 671533. The reversal of 671529 is 925176.

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 not a de Polignac number, because 671529 - 2⁷ = 671401 is a prime.

It is a D-number.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 671496 and 671505.

It is not an unprimeable number, because it can be changed into a prime (671519) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 111919 + ... + 111924.

It is an arithmetic number, because the mean of its divisors is an integer number (223844).

2⁶⁷¹⁵²⁹ is an apocalyptic number.

It is an amenable number.

671529 is a deficient number, since it is larger than the sum of its proper divisors (223847).

671529 is a wasteful number, since it uses less digits than its factorization.

671529 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 223846.

The product of its digits is 3780, while the sum is 30.

The square root of 671529 is about 819.4687303369. The cubic root of 671529 is about 87.5699141904.

It can be divided in two parts, 67152 and 9, that added together give a triangular number (67161 = T₃₆₆).

The spelling of 671529 in words is "six hundred seventy-one thousand, five hundred twenty-nine".