671653 has 4 divisors (see below), whose sum is σ = 711180. Its totient is φ = 632128.

The previous prime is 671651. The next prime is 671681. The reversal of 671653 is 356176.

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

It can be written as a sum of positive squares in 2 ways, for example, as 332929 + 338724 = 577^2 + 582^2 .

It is not a de Polignac number, because 671653 - 2¹ = 671651 is a prime.

It is a super-2 number, since 2×671653² = 902235504818, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (671651) 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, 19738 + ... + 19771.

It is an arithmetic number, because the mean of its divisors is an integer number (177795).

2⁶⁷¹⁶⁵³ is an apocalyptic number.

It is an amenable number.

671653 is a deficient number, since it is larger than the sum of its proper divisors (39527).

671653 is a wasteful number, since it uses less digits than its factorization.

671653 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39526.

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

The square root of 671653 is about 819.5443856192. The cubic root of 671653 is about 87.5753038812.

The spelling of 671653 in words is "six hundred seventy-one thousand, six hundred fifty-three".