647736241 has 2 divisors, whose sum is σ = 647736242. Its totient is φ = 647736240.

The previous prime is 647736223. The next prime is 647736263. The reversal of 647736241 is 142637746.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 631768225 + 15968016 = 25135^2 + 3996^2 .

It is a cyclic number.

It is not a de Polignac number, because 647736241 - 2⁵ = 647736209 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 647736194 and 647736203.

It is not a weakly prime, because it can be changed into another prime (647736641) 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, 323868120 + 323868121.

It is an arithmetic number, because the mean of its divisors is an integer number (323868121).

Almost surely, 2^647736241 is an apocalyptic number.

It is an amenable number.

647736241 is a deficient number, since it is larger than the sum of its proper divisors (1).

647736241 is an equidigital number, since it uses as much as digits as its factorization.

647736241 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 169344, while the sum is 40.

The square root of 647736241 is about 25450.6628793829. The cubic root of 647736241 is about 865.2323168977.

The spelling of 647736241 in words is "six hundred forty-seven million, seven hundred thirty-six thousand, two hundred forty-one".