647958923 has 2 divisors, whose sum is σ = 647958924. Its totient is φ = 647958922.

The previous prime is 647958887. The next prime is 647958979. The reversal of 647958923 is 329859746.

It is a happy number.

647958923 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 647958923 - 2²⁶ = 580850059 is a prime.

It is not a weakly prime, because it can be changed into another prime (647988923) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323979461 + 323979462.

It is an arithmetic number, because the mean of its divisors is an integer number (323979462).

Almost surely, 2^647958923 is an apocalyptic number.

647958923 is a deficient number, since it is larger than the sum of its proper divisors (1).

647958923 is an equidigital number, since it uses as much as digits as its factorization.

647958923 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3265920, while the sum is 53.

The square root of 647958923 is about 25455.0372814498. The cubic root of 647958923 is about 865.3314568334.

The spelling of 647958923 in words is "six hundred forty-seven million, nine hundred fifty-eight thousand, nine hundred twenty-three".