91000009845 has 32 divisors (see below), whose sum is σ = 161793484800. Its totient is φ = 48528631872.

The previous prime is 91000009811. The next prime is 91000009853. The reversal of 91000009845 is 54890000019.

It is not a de Polignac number, because 91000009845 - 2¹¹ = 91000007797 is a prime.

It is a congruent number.

It is an unprimeable number.

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, 1705644 + ... + 1758186.

It is an arithmetic number, because the mean of its divisors is an integer number (5056046400).

Almost surely, 2^91000009845 is an apocalyptic number.

It is an amenable number.

91000009845 is a deficient number, since it is larger than the sum of its proper divisors (70793474955).

91000009845 is a wasteful number, since it uses less digits than its factorization.

91000009845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65386 (or 65380 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 36.

The spelling of 91000009845 in words is "ninety-one billion, nine thousand, eight hundred forty-five".