647915009 has 4 divisors (see below), whose sum is σ = 740474304. Its totient is φ = 555355716.

The previous prime is 647914997. The next prime is 647915017. The reversal of 647915009 is 900519746.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 647915009 - 2²⁰ = 646866433 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (647915209) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 46279637 + ... + 46279650.

It is an arithmetic number, because the mean of its divisors is an integer number (185118576).

Almost surely, 2^647915009 is an apocalyptic number.

It is an amenable number.

647915009 is a deficient number, since it is larger than the sum of its proper divisors (92559295).

647915009 is an equidigital number, since it uses as much as digits as its factorization.

647915009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92559294.

The product of its (nonzero) digits is 68040, while the sum is 41.

The square root of 647915009 is about 25454.1746870725. The cubic root of 647915009 is about 865.3119077423.

The spelling of 647915009 in words is "six hundred forty-seven million, nine hundred fifteen thousand, nine".