671211691 has 8 divisors (see below), whose sum is σ = 701086464. Its totient is φ = 641394600.

The previous prime is 671211661. The next prime is 671211743. The reversal of 671211691 is 196112176.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 671211691 - 2¹³ = 671203499 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (671211601) 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 7 ways as a sum of consecutive naturals, for example, 10290 + ... + 38056.

It is an arithmetic number, because the mean of its divisors is an integer number (87635808).

Almost surely, 2^671211691 is an apocalyptic number.

671211691 is a deficient number, since it is larger than the sum of its proper divisors (29874773).

671211691 is a wasteful number, since it uses less digits than its factorization.

671211691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28841.

The product of its digits is 4536, while the sum is 34.

The square root of 671211691 is about 25907.7534919568. The cubic root of 671211691 is about 875.5611925392.

The spelling of 671211691 in words is "six hundred seventy-one million, two hundred eleven thousand, six hundred ninety-one".