671509439 has 8 divisors (see below), whose sum is σ = 688353792. Its totient is φ = 654687360.

The previous prime is 671509379. The next prime is 671509441. The reversal of 671509439 is 934905176.

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 671509439 - 2¹² = 671505343 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 671509439.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (671509939) 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, 67202 + ... + 76544.

It is an arithmetic number, because the mean of its divisors is an integer number (86044224).

Almost surely, 2^671509439 is an apocalyptic number.

671509439 is a deficient number, since it is larger than the sum of its proper divisors (16844353).

671509439 is a wasteful number, since it uses less digits than its factorization.

671509439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11137.

The product of its (nonzero) digits is 204120, while the sum is 44.

The square root of 671509439 is about 25913.4991654929. The cubic root of 671509439 is about 875.6906390605.

The spelling of 671509439 in words is "six hundred seventy-one million, five hundred nine thousand, four hundred thirty-nine".