647713273 has 2 divisors, whose sum is σ = 647713274. Its totient is φ = 647713272.

The previous prime is 647713237. The next prime is 647713291. The reversal of 647713273 is 372317746.

Together with previous prime (647713237) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 522899689 + 124813584 = 22867^2 + 11172^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-647713273 is a prime.

It is not a weakly prime, because it can be changed into another prime (647713223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323856636 + 323856637.

It is an arithmetic number, because the mean of its divisors is an integer number (323856637).

Almost surely, 2^647713273 is an apocalyptic number.

It is an amenable number.

647713273 is a deficient number, since it is larger than the sum of its proper divisors (1).

647713273 is an equidigital number, since it uses as much as digits as its factorization.

647713273 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 148176, while the sum is 40.

The square root of 647713273 is about 25450.2116494146. The cubic root of 647713273 is about 865.2220900546. Note that the first 3 decimals are identical.

The spelling of 647713273 in words is "six hundred forty-seven million, seven hundred thirteen thousand, two hundred seventy-three".