647716361 has 4 divisors (see below), whose sum is σ = 658334724. Its totient is φ = 637098000.

The previous prime is 647716309. The next prime is 647716369. The reversal of 647716361 is 163617746.

647716361 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 163617746 = 2 ⋅81808873.

It can be written as a sum of positive squares in 2 ways, for example, as 26460736 + 621255625 = 5144^2 + 24925^2 .

It is a cyclic number.

It is not a de Polignac number, because 647716361 - 2⁶ = 647716297 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (647716369) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5309090 + ... + 5309211.

It is an arithmetic number, because the mean of its divisors is an integer number (164583681).

Almost surely, 2^647716361 is an apocalyptic number.

647716361 is a gapful number since it is divisible by the number (61) formed by its first and last digit.

It is an amenable number.

647716361 is a deficient number, since it is larger than the sum of its proper divisors (10618363).

647716361 is a wasteful number, since it uses less digits than its factorization.

647716361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10618362.

The product of its digits is 127008, while the sum is 41.

The square root of 647716361 is about 25450.2723168142. The cubic root of 647716361 is about 865.2234650465.

The spelling of 647716361 in words is "six hundred forty-seven million, seven hundred sixteen thousand, three hundred sixty-one".