671138653 has 16 divisors (see below), whose sum is σ = 720489600. Its totient is φ = 623263680.

The previous prime is 671138639. The next prime is 671138659. The reversal of 671138653 is 356831176.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 671138653 - 2⁵ = 671138621 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (671138659) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 415275 + ... + 416887.

It is an arithmetic number, because the mean of its divisors is an integer number (45030600).

Almost surely, 2^671138653 is an apocalyptic number.

It is an amenable number.

671138653 is a deficient number, since it is larger than the sum of its proper divisors (49350947).

671138653 is a wasteful number, since it uses less digits than its factorization.

671138653 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2052.

The product of its digits is 90720, while the sum is 40.

The square root of 671138653 is about 25906.3438755838. The cubic root of 671138653 is about 875.5294332801.

The spelling of 671138653 in words is "six hundred seventy-one million, one hundred thirty-eight thousand, six hundred fifty-three".