647542939 has 2 divisors, whose sum is σ = 647542940. Its totient is φ = 647542938.

The previous prime is 647542867. The next prime is 647542969. The reversal of 647542939 is 939245746.

647542939 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 647542939 - 2⁷ = 647542811 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 647542892 and 647542901.

It is not a weakly prime, because it can be changed into another prime (647542969) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323771469 + 323771470.

It is an arithmetic number, because the mean of its divisors is an integer number (323771470).

Almost surely, 2^647542939 is an apocalyptic number.

647542939 is a deficient number, since it is larger than the sum of its proper divisors (1).

647542939 is an equidigital number, since it uses as much as digits as its factorization.

647542939 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1632960, while the sum is 49.

The square root of 647542939 is about 25446.8650131996. The cubic root of 647542939 is about 865.1462387654.

The spelling of 647542939 in words is "six hundred forty-seven million, five hundred forty-two thousand, nine hundred thirty-nine".