1581399860839 has 2 divisors, whose sum is σ = 1581399860840. Its totient is φ = 1581399860838.

The previous prime is 1581399860809. The next prime is 1581399860851. The reversal of 1581399860839 is 9380689931851.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1581399860839 - 2²³ = 1581391472231 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1581399860809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 790699930419 + 790699930420.

It is an arithmetic number, because the mean of its divisors is an integer number (790699930420).

Almost surely, 2^{1581399860839} is an apocalyptic number.

1581399860839 is a deficient number, since it is larger than the sum of its proper divisors (1).

1581399860839 is an equidigital number, since it uses as much as digits as its factorization.

1581399860839 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 100776960, while the sum is 70.

The spelling of 1581399860839 in words is "one trillion, five hundred eighty-one billion, three hundred ninety-nine million, eight hundred sixty thousand, eight hundred thirty-nine".