647617361 has 2 divisors, whose sum is σ = 647617362. Its totient is φ = 647617360.

The previous prime is 647617343. The next prime is 647617403. The reversal of 647617361 is 163716746.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 596580625 + 51036736 = 24425^2 + 7144^2 .

It is a cyclic number.

It is not a de Polignac number, because 647617361 - 2¹⁴ = 647600977 is a prime.

It is not a weakly prime, because it can be changed into another prime (647617301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323808680 + 323808681.

It is an arithmetic number, because the mean of its divisors is an integer number (323808681).

Almost surely, 2^647617361 is an apocalyptic number.

It is an amenable number.

647617361 is a deficient number, since it is larger than the sum of its proper divisors (1).

647617361 is an equidigital number, since it uses as much as digits as its factorization.

647617361 is an evil number, because the sum of its binary digits is even.

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

The square root of 647617361 is about 25448.3272731235. The cubic root of 647617361 is about 865.1793811992.

The spelling of 647617361 in words is "six hundred forty-seven million, six hundred seventeen thousand, three hundred sixty-one".