671350891 has 4 divisors (see below), whose sum is σ = 671405752. Its totient is φ = 671296032.

The previous prime is 671350879. The next prime is 671350907. The reversal of 671350891 is 198053176.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-671350891 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (671350831) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 211 + ... + 36643.

It is an arithmetic number, because the mean of its divisors is an integer number (167851438).

Almost surely, 2^671350891 is an apocalyptic number.

671350891 is a deficient number, since it is larger than the sum of its proper divisors (54861).

671350891 is a wasteful number, since it uses less digits than its factorization.

671350891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54860.

The product of its (nonzero) digits is 45360, while the sum is 40.

The square root of 671350891 is about 25910.4398071511. The cubic root of 671350891 is about 875.6217147735.

The spelling of 671350891 in words is "six hundred seventy-one million, three hundred fifty thousand, eight hundred ninety-one".