1306866139 has 2 divisors, whose sum is σ = 1306866140. Its totient is φ = 1306866138.

The previous prime is 1306866137. The next prime is 1306866149. The reversal of 1306866139 is 9316686031.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1306866139 - 2¹ = 1306866137 is a prime.

Together with 1306866137, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 1306866095 and 1306866104.

It is not a weakly prime, because it can be changed into another prime (1306866137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 653433069 + 653433070.

It is an arithmetic number, because the mean of its divisors is an integer number (653433070).

Almost surely, 2^1306866139 is an apocalyptic number.

1306866139 is a deficient number, since it is larger than the sum of its proper divisors (1).

1306866139 is an equidigital number, since it uses as much as digits as its factorization.

1306866139 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 139968, while the sum is 43.

The square root of 1306866139 is about 36150.6035772572. The cubic root of 1306866139 is about 1093.3109602075.

The spelling of 1306866139 in words is "one billion, three hundred six million, eight hundred sixty-six thousand, one hundred thirty-nine".