91310009791 has 32 divisors (see below), whose sum is σ = 129050611200. Its totient is φ = 62220804480.

The previous prime is 91310009669. The next prime is 91310009891. The reversal of 91310009791 is 19790001319.

It is a cyclic number.

It is not a de Polignac number, because 91310009791 - 2¹³ = 91310001599 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91310009491) 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 in 31 ways as a sum of consecutive naturals, for example, 2381476 + ... + 2419513.

It is an arithmetic number, because the mean of its divisors is an integer number (4032831600).

Almost surely, 2^91310009791 is an apocalyptic number.

91310009791 is a gapful number since it is divisible by the number (91) formed by its first and last digit.

91310009791 is a deficient number, since it is larger than the sum of its proper divisors (37740601409).

91310009791 is a wasteful number, since it uses less digits than its factorization.

91310009791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4801039.

The product of its (nonzero) digits is 15309, while the sum is 40.

The spelling of 91310009791 in words is "ninety-one billion, three hundred ten million, nine thousand, seven hundred ninety-one".