671579909 has 32 divisors (see below), whose sum is σ = 949186560. Its totient is φ = 457617600.

The previous prime is 671579863. The next prime is 671579971. The reversal of 671579909 is 909975176.

It is not a de Polignac number, because 671579909 - 2¹² = 671575813 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (671579989) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1364 + ... + 36674.

It is an arithmetic number, because the mean of its divisors is an integer number (29662080).

Almost surely, 2^671579909 is an apocalyptic number.

It is an amenable number.

671579909 is a deficient number, since it is larger than the sum of its proper divisors (277606651).

671579909 is a wasteful number, since it uses less digits than its factorization.

671579909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35361.

The product of its (nonzero) digits is 1071630, while the sum is 53.

The square root of 671579909 is about 25914.8588458436. The cubic root of 671579909 is about 875.7212704297.

The spelling of 671579909 in words is "six hundred seventy-one million, five hundred seventy-nine thousand, nine hundred nine".