635671 has 4 divisors (see below), whose sum is σ = 638352. Its totient is φ = 632992.

The previous prime is 635659. The next prime is 635689. The reversal of 635671 is 176536.

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

It is a cyclic number.

It is not a de Polignac number, because 635671 - 2⁵ = 635639 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 15.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (635471) 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, 946 + ... + 1471.

It is an arithmetic number, because the mean of its divisors is an integer number (159588).

2⁶³⁵⁶⁷¹ is an apocalyptic number.

635671 is a deficient number, since it is larger than the sum of its proper divisors (2681).

635671 is a wasteful number, since it uses less digits than its factorization.

635671 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2680.

The product of its digits is 3780, while the sum is 28.

The square root of 635671 is about 797.2897842065. The cubic root of 635671 is about 85.9826447762.

The spelling of 635671 in words is "six hundred thirty-five thousand, six hundred seventy-one".