91085738833 has 4 divisors (see below), whose sum is σ = 91194304320. Its totient is φ = 90977173348.

The previous prime is 91085738791. The next prime is 91085738837. The reversal of 91085738833 is 33883758019.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 91085738833 - 2⁹ = 91085738321 is a prime.

It is a super-2 number, since 2×91085738833² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91085738837) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 54281485 + ... + 54283162.

It is an arithmetic number, because the mean of its divisors is an integer number (22798576080).

Almost surely, 2^91085738833 is an apocalyptic number.

It is an amenable number.

91085738833 is a deficient number, since it is larger than the sum of its proper divisors (108565487).

91085738833 is a wasteful number, since it uses less digits than its factorization.

91085738833 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108565486.

The product of its (nonzero) digits is 4354560, while the sum is 55.

The spelling of 91085738833 in words is "ninety-one billion, eighty-five million, seven hundred thirty-eight thousand, eight hundred thirty-three".