671404091 has 4 divisors (see below), whose sum is σ = 671815872. Its totient is φ = 670992312.

The previous prime is 671404087. The next prime is 671404147. The reversal of 671404091 is 190404176.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 671404091 - 2² = 671404087 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (671404031) 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 3 ways as a sum of consecutive naturals, for example, 203435 + ... + 206708.

It is an arithmetic number, because the mean of its divisors is an integer number (167953968).

Almost surely, 2^671404091 is an apocalyptic number.

671404091 is a deficient number, since it is larger than the sum of its proper divisors (411781).

671404091 is a wasteful number, since it uses less digits than its factorization.

671404091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 411780.

The product of its (nonzero) digits is 6048, while the sum is 32.

The square root of 671404091 is about 25911.4664000322. The cubic root of 671404091 is about 875.6448431879.

The spelling of 671404091 in words is "six hundred seventy-one million, four hundred four thousand, ninety-one".