91750838387 has 4 divisors (see below), whose sum is σ = 98808595200. Its totient is φ = 84693081576.

The previous prime is 91750838381. The next prime is 91750838419. The reversal of 91750838387 is 78383805719.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 78383805719 = 23 ⋅3407991553.

It is a cyclic number.

It is not a de Polignac number, because 91750838387 - 2⁴ = 91750838371 is a prime.

It is a super-3 number, since 3×91750838387³ (a number of 34 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91750838381) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3528878387 + ... + 3528878412.

It is an arithmetic number, because the mean of its divisors is an integer number (24702148800).

Almost surely, 2^91750838387 is an apocalyptic number.

91750838387 is a deficient number, since it is larger than the sum of its proper divisors (7057756813).

91750838387 is a wasteful number, since it uses less digits than its factorization.

91750838387 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7057756812.

The product of its (nonzero) digits is 10160640, while the sum is 59.

The spelling of 91750838387 in words is "ninety-one billion, seven hundred fifty million, eight hundred thirty-eight thousand, three hundred eighty-seven".