671975261 has 8 divisors (see below), whose sum is σ = 708002400. Its totient is φ = 636014160.

The previous prime is 671975231. The next prime is 671975279. The reversal of 671975261 is 162579176.

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 671975261 - 2⁶ = 671975197 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 (671975231) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5126 + ... + 37016.

It is an arithmetic number, because the mean of its divisors is an integer number (88500300).

Almost surely, 2^671975261 is an apocalyptic number.

It is an amenable number.

671975261 is a deficient number, since it is larger than the sum of its proper divisors (36027139).

671975261 is a wasteful number, since it uses less digits than its factorization.

671975261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33019.

The product of its digits is 158760, while the sum is 44.

The square root of 671975261 is about 25922.4856254179. The cubic root of 671975261 is about 875.8930793413.

The spelling of 671975261 in words is "six hundred seventy-one million, nine hundred seventy-five thousand, two hundred sixty-one".