647853047 has 2 divisors, whose sum is σ = 647853048. Its totient is φ = 647853046.

The previous prime is 647852993. The next prime is 647853049. The reversal of 647853047 is 740358746.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 647853047 - 2²⁰ = 646804471 is a prime.

Together with 647853049, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 647852989 and 647853007.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (647853049) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323926523 + 323926524.

It is an arithmetic number, because the mean of its divisors is an integer number (323926524).

Almost surely, 2^647853047 is an apocalyptic number.

647853047 is a deficient number, since it is larger than the sum of its proper divisors (1).

647853047 is an equidigital number, since it uses as much as digits as its factorization.

647853047 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 564480, while the sum is 44.

The square root of 647853047 is about 25452.9575295289. The cubic root of 647853047 is about 865.2843227633.

The spelling of 647853047 in words is "six hundred forty-seven million, eight hundred fifty-three thousand, forty-seven".