671563 has 4 divisors (see below), whose sum is σ = 684288. Its totient is φ = 658840.

The previous prime is 671557. The next prime is 671581. The reversal of 671563 is 365176.

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 671563 - 2¹³ = 663371 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (671533) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6283 + ... + 6388.

It is an arithmetic number, because the mean of its divisors is an integer number (171072).

2⁶⁷¹⁵⁶³ is an apocalyptic number.

671563 is a deficient number, since it is larger than the sum of its proper divisors (12725).

671563 is a wasteful number, since it uses less digits than its factorization.

671563 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12724.

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

The square root of 671563 is about 819.4894752222. The cubic root of 671563 is about 87.5713920748.

It can be divided in two parts, 671 and 563, that multiplied together give a palindrome (377773).

The spelling of 671563 in words is "six hundred seventy-one thousand, five hundred sixty-three".