91391835654 has 128 divisors (see below), whose sum is σ = 236937692160. Its totient is φ = 25572153600.

The previous prime is 91391835653. The next prime is 91391835697. The reversal of 91391835654 is 45653819319.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 91391835654.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91391835653) 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 63 ways as a sum of consecutive naturals, for example, 5364009 + ... + 5381019.

It is an arithmetic number, because the mean of its divisors is an integer number (1851075720).

Almost surely, 2^91391835654 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 91391835654, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (118468846080).

91391835654 is an abundant number, since it is smaller than the sum of its proper divisors (145545856506).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

91391835654 is a wasteful number, since it uses less digits than its factorization.

91391835654 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17323 (or 17317 counting only the distinct ones).

The product of its digits is 3499200, while the sum is 54.

The spelling of 91391835654 in words is "ninety-one billion, three hundred ninety-one million, eight hundred thirty-five thousand, six hundred fifty-four".