647316081 has 24 divisors (see below), whose sum is σ = 959830560. Its totient is φ = 420228096.

The previous prime is 647316049. The next prime is 647316091. The reversal of 647316081 is 180613746.

647316081 is a `hidden beast` number, since 6 + 47 + 3 + 1 + 608 + 1 = 666.

It is not a de Polignac number, because 647316081 - 2⁵ = 647316049 is a prime.

It is a super-2 number, since 2×647316081² = 838036217442397122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (647316031) 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 23 ways as a sum of consecutive naturals, for example, 51121 + ... + 62513.

It is an arithmetic number, because the mean of its divisors is an integer number (39992940).

Almost surely, 2^647316081 is an apocalyptic number.

It is an amenable number.

647316081 is a deficient number, since it is larger than the sum of its proper divisors (312514479).

647316081 is a wasteful number, since it uses less digits than its factorization.

647316081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11565 (or 11562 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 36.

The square root of 647316081 is about 25442.4071384765. The cubic root of 647316081 is about 865.0451961639.

The spelling of 647316081 in words is "six hundred forty-seven million, three hundred sixteen thousand, eighty-one".