647378959 has 2 divisors, whose sum is σ = 647378960. Its totient is φ = 647378958.

The previous prime is 647378939. The next prime is 647379037. The reversal of 647378959 is 959873746.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 647378959 - 2¹⁹ = 646854671 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (647378939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323689479 + 323689480.

It is an arithmetic number, because the mean of its divisors is an integer number (323689480).

Almost surely, 2^647378959 is an apocalyptic number.

647378959 is a deficient number, since it is larger than the sum of its proper divisors (1).

647378959 is an equidigital number, since it uses as much as digits as its factorization.

647378959 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11430720, while the sum is 58.

The square root of 647378959 is about 25443.6428012971. The cubic root of 647378959 is about 865.0732044030.

The spelling of 647378959 in words is "six hundred forty-seven million, three hundred seventy-eight thousand, nine hundred fifty-nine".