671913 has 18 divisors (see below), whose sum is σ = 1068522. Its totient is φ = 406560.

The previous prime is 671911. The next prime is 671917. The reversal of 671913 is 319176.

It can be written as a sum of positive squares in only one way, i.e., 393129 + 278784 = 627^2 + 528^2 .

It is not a de Polignac number, because 671913 - 2¹ = 671911 is a prime.

It is a super-3 number, since 3×671913³ = 910039799503336491, which contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (671911) 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 17 ways as a sum of consecutive naturals, for example, 781 + ... + 1397.

2⁶⁷¹⁹¹³ is an apocalyptic number.

It is an amenable number.

671913 is a deficient number, since it is larger than the sum of its proper divisors (396609).

671913 is a wasteful number, since it uses less digits than its factorization.

671913 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 645 (or 631 counting only the distinct ones).

The product of its digits is 1134, while the sum is 27.

The square root of 671913 is about 819.7029949927. The cubic root of 671913 is about 87.5866026925.

The spelling of 671913 in words is "six hundred seventy-one thousand, nine hundred thirteen".