671140591 has 16 divisors (see below), whose sum is σ = 797270400. Its totient is φ = 558079200.

The previous prime is 671140583. The next prime is 671140597. The reversal of 671140591 is 195041176.

It is a cyclic number.

It is not a de Polignac number, because 671140591 - 2³ = 671140583 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (671140597) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 49305 + ... + 61426.

It is an arithmetic number, because the mean of its divisors is an integer number (49829400).

Almost surely, 2^671140591 is an apocalyptic number.

671140591 is a deficient number, since it is larger than the sum of its proper divisors (126129809).

671140591 is a wasteful number, since it uses less digits than its factorization.

671140591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110790.

The product of its (nonzero) digits is 7560, while the sum is 34.

The square root of 671140591 is about 25906.3812795226. The cubic root of 671140591 is about 875.5302760142.

The spelling of 671140591 in words is "six hundred seventy-one million, one hundred forty thousand, five hundred ninety-one".