647808853 has 2 divisors, whose sum is σ = 647808854. Its totient is φ = 647808852.

The previous prime is 647808841. The next prime is 647808859. The reversal of 647808853 is 358808746.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 386436964 + 261371889 = 19658^2 + 16167^2 .

It is a cyclic number.

It is not a de Polignac number, because 647808853 - 2¹³ = 647800661 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 647808797 and 647808806.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (647808859) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323904426 + 323904427.

It is an arithmetic number, because the mean of its divisors is an integer number (323904427).

Almost surely, 2^647808853 is an apocalyptic number.

It is an amenable number.

647808853 is a deficient number, since it is larger than the sum of its proper divisors (1).

647808853 is an equidigital number, since it uses as much as digits as its factorization.

647808853 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1290240, while the sum is 49.

The square root of 647808853 is about 25452.0893641367. The cubic root of 647808853 is about 865.2646468789.

The spelling of 647808853 in words is "six hundred forty-seven million, eight hundred eight thousand, eight hundred fifty-three".