647570923 has 2 divisors, whose sum is σ = 647570924. Its totient is φ = 647570922.

The previous prime is 647570921. The next prime is 647570941. The reversal of 647570923 is 329075746.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 647570923 - 2¹ = 647570921 is a prime.

Together with 647570921, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 647570923.

It is not a weakly prime, because it can be changed into another prime (647570921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323785461 + 323785462.

It is an arithmetic number, because the mean of its divisors is an integer number (323785462).

Almost surely, 2^647570923 is an apocalyptic number.

647570923 is a deficient number, since it is larger than the sum of its proper divisors (1).

647570923 is an equidigital number, since it uses as much as digits as its factorization.

647570923 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 317520, while the sum is 43.

The square root of 647570923 is about 25447.4148588810. The cubic root of 647570923 is about 865.1587012098.

The spelling of 647570923 in words is "six hundred forty-seven million, five hundred seventy thousand, nine hundred twenty-three".