647130909 has 8 divisors (see below), whose sum is σ = 863652640. Its totient is φ = 431014896.

The previous prime is 647130907. The next prime is 647130931. The reversal of 647130909 is 909031746.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 647130909 - 2¹ = 647130907 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 (647130907) 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, 97687 + ... + 104100.

It is an arithmetic number, because the mean of its divisors is an integer number (107956580).

Almost surely, 2^647130909 is an apocalyptic number.

It is an amenable number.

647130909 is a deficient number, since it is larger than the sum of its proper divisors (216521731).

647130909 is a wasteful number, since it uses less digits than its factorization.

647130909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 202859.

The product of its (nonzero) digits is 40824, while the sum is 39.

The square root of 647130909 is about 25438.7678357266. The cubic root of 647130909 is about 864.9627030150.

The spelling of 647130909 in words is "six hundred forty-seven million, one hundred thirty thousand, nine hundred nine".