91019873039 has 2 divisors, whose sum is σ = 91019873040. Its totient is φ = 91019873038.

The previous prime is 91019873003. The next prime is 91019873051. The reversal of 91019873039 is 93037891019.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (93037891019) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 91019873039 - 2²⁸ = 90751437583 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91019873839) 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, 45509936519 + 45509936520.

It is an arithmetic number, because the mean of its divisors is an integer number (45509936520).

Almost surely, 2^91019873039 is an apocalyptic number.

91019873039 is a deficient number, since it is larger than the sum of its proper divisors (1).

91019873039 is an equidigital number, since it uses as much as digits as its factorization.

91019873039 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 367416, while the sum is 50.

The spelling of 91019873039 in words is "ninety-one billion, nineteen million, eight hundred seventy-three thousand, thirty-nine".