647650291 has 2 divisors, whose sum is σ = 647650292. Its totient is φ = 647650290.

The previous prime is 647650253. The next prime is 647650303. The reversal of 647650291 is 192056746.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 647650291 - 2²⁹ = 110779379 is a prime.

It is not a weakly prime, because it can be changed into another prime (647650231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323825145 + 323825146.

It is an arithmetic number, because the mean of its divisors is an integer number (323825146).

Almost surely, 2^647650291 is an apocalyptic number.

647650291 is a deficient number, since it is larger than the sum of its proper divisors (1).

647650291 is an equidigital number, since it uses as much as digits as its factorization.

647650291 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 90720, while the sum is 40.

The square root of 647650291 is about 25448.9742622370. The cubic root of 647650291 is about 865.1940451432.

The spelling of 647650291 in words is "six hundred forty-seven million, six hundred fifty thousand, two hundred ninety-one".