653671 has 4 divisors (see below), whose sum is σ = 655600. Its totient is φ = 651744.

The previous prime is 653659. The next prime is 653687. The reversal of 653671 is 176356.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-653671 is a prime.

It is an Ulam number.

It is a Duffinian number.

653671 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (653621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 306 + ... + 1183.

It is an arithmetic number, because the mean of its divisors is an integer number (163900).

2⁶⁵³⁶⁷¹ is an apocalyptic number.

653671 is a deficient number, since it is larger than the sum of its proper divisors (1929).

653671 is a wasteful number, since it uses less digits than its factorization.

653671 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1928.

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

The square root of 653671 is about 808.4992269631. The cubic root of 653671 is about 86.7866795589.

The spelling of 653671 in words is "six hundred fifty-three thousand, six hundred seventy-one".