1591236505139 has 2 divisors, whose sum is σ = 1591236505140. Its totient is φ = 1591236505138.

The previous prime is 1591236505081. The next prime is 1591236505151. The reversal of 1591236505139 is 9315056321951.

It is a strong prime.

It is an emirp because it is prime and its reverse (9315056321951) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1591236505139 - 2²⁰ = 1591235456563 is a prime.

It is not a weakly prime, because it can be changed into another prime (1591236502139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 795618252569 + 795618252570.

It is an arithmetic number, because the mean of its divisors is an integer number (795618252570).

Almost surely, 2^{1591236505139} is an apocalyptic number.

1591236505139 is a deficient number, since it is larger than the sum of its proper divisors (1).

1591236505139 is an equidigital number, since it uses as much as digits as its factorization.

1591236505139 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1093500, while the sum is 50.

The spelling of 1591236505139 in words is "one trillion, five hundred ninety-one billion, two hundred thirty-six million, five hundred five thousand, one hundred thirty-nine".