91850008519 has 2 divisors, whose sum is σ = 91850008520. Its totient is φ = 91850008518.

The previous prime is 91850008511. The next prime is 91850008541. The reversal of 91850008519 is 91580005819.

It is a weak prime.

It is an emirp because it is prime and its reverse (91580005819) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 91850008519 - 2³ = 91850008511 is a prime.

It is a super-2 number, since 2×91850008519² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91850008511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45925004259 + 45925004260.

It is an arithmetic number, because the mean of its divisors is an integer number (45925004260).

Almost surely, 2^91850008519 is an apocalyptic number.

91850008519 is a deficient number, since it is larger than the sum of its proper divisors (1).

91850008519 is an equidigital number, since it uses as much as digits as its factorization.

91850008519 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 129600, while the sum is 46.

The spelling of 91850008519 in words is "ninety-one billion, eight hundred fifty million, eight thousand, five hundred nineteen".