671953 has 4 divisors (see below), whose sum is σ = 678708. Its totient is φ = 665200.

The previous prime is 671947. The next prime is 671969. The reversal of 671953 is 359176.

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 321489 + 350464 = 567^2 + 592^2 .

It is a cyclic number.

It is not a de Polignac number, because 671953 - 2⁵ = 671921 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (671903) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3226 + ... + 3427.

It is an arithmetic number, because the mean of its divisors is an integer number (169677).

2⁶⁷¹⁹⁵³ is an apocalyptic number.

It is an amenable number.

671953 is a deficient number, since it is larger than the sum of its proper divisors (6755).

671953 is a wasteful number, since it uses less digits than its factorization.

671953 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6754.

The product of its digits is 5670, while the sum is 31.

The square root of 671953 is about 819.7273937109. The cubic root of 671953 is about 87.5883407125.

The spelling of 671953 in words is "six hundred seventy-one thousand, nine hundred fifty-three".