91573340839 has 2 divisors, whose sum is σ = 91573340840. Its totient is φ = 91573340838.

The previous prime is 91573340813. The next prime is 91573340941. The reversal of 91573340839 is 93804337519.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 91573340839 - 2²⁵ = 91539786407 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91573343839) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45786670419 + 45786670420.

It is an arithmetic number, because the mean of its divisors is an integer number (45786670420).

Almost surely, 2^91573340839 is an apocalyptic number.

91573340839 is a deficient number, since it is larger than the sum of its proper divisors (1).

91573340839 is an equidigital number, since it uses as much as digits as its factorization.

91573340839 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2449440, while the sum is 52.

The spelling of 91573340839 in words is "ninety-one billion, five hundred seventy-three million, three hundred forty thousand, eight hundred thirty-nine".