1647648139 has 2 divisors, whose sum is σ = 1647648140. Its totient is φ = 1647648138.

The previous prime is 1647648133. The next prime is 1647648169. The reversal of 1647648139 is 9318467461.

It is a weak prime.

It is an emirp because it is prime and its reverse (9318467461) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1647648139 - 2³ = 1647648131 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1647648092 and 1647648101.

It is not a weakly prime, because it can be changed into another prime (1647648131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 823824069 + 823824070.

It is an arithmetic number, because the mean of its divisors is an integer number (823824070).

Almost surely, 2^1647648139 is an apocalyptic number.

1647648139 is a deficient number, since it is larger than the sum of its proper divisors (1).

1647648139 is an equidigital number, since it uses as much as digits as its factorization.

1647648139 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 870912, while the sum is 49.

The square root of 1647648139 is about 40591.2322922081. The cubic root of 1647648139 is about 1181.1040464145.

The spelling of 1647648139 in words is "one billion, six hundred forty-seven million, six hundred forty-eight thousand, one hundred thirty-nine".