647341139 has 2 divisors, whose sum is σ = 647341140. Its totient is φ = 647341138.

The previous prime is 647341067. The next prime is 647341157. The reversal of 647341139 is 931143746.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-647341139 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (647341439) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323670569 + 323670570.

It is an arithmetic number, because the mean of its divisors is an integer number (323670570).

Almost surely, 2^647341139 is an apocalyptic number.

647341139 is a deficient number, since it is larger than the sum of its proper divisors (1).

647341139 is an equidigital number, since it uses as much as digits as its factorization.

647341139 is an evil number, because the sum of its binary digits is even.

The product of its digits is 54432, while the sum is 38.

The square root of 647341139 is about 25442.8995792539. The cubic root of 647341139 is about 865.0563581621.

The spelling of 647341139 in words is "six hundred forty-seven million, three hundred forty-one thousand, one hundred thirty-nine".