671427909 has 12 divisors (see below), whose sum is σ = 1020884800. Its totient is φ = 424059624.

The previous prime is 671427907. The next prime is 671427917. The reversal of 671427909 is 909724176.

It is not a de Polignac number, because 671427909 - 2¹ = 671427907 is a prime.

It is a super-4 number, since 4×671427909⁴ (a number of 36 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (671427907) 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 11 ways as a sum of consecutive naturals, for example, 1963069 + ... + 1963410.

Almost surely, 2^671427909 is an apocalyptic number.

It is an amenable number.

671427909 is a deficient number, since it is larger than the sum of its proper divisors (349456891).

671427909 is a wasteful number, since it uses less digits than its factorization.

671427909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3926504 (or 3926501 counting only the distinct ones).

The product of its (nonzero) digits is 190512, while the sum is 45.

The square root of 671427909 is about 25911.9259994312. The cubic root of 671427909 is about 875.6551975396.

The spelling of 671427909 in words is "six hundred seventy-one million, four hundred twenty-seven thousand, nine hundred nine".