91101391 has 8 divisors (see below), whose sum is σ = 94050000. Its totient is φ = 88190592.

The previous prime is 91101349. The next prime is 91101401. The reversal of 91101391 is 19310119.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 91101391 - 2⁹ = 91100879 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91101331) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4516 + ... + 14233.

It is an arithmetic number, because the mean of its divisors is an integer number (11756250).

Almost surely, 2^91101391 is an apocalyptic number.

91101391 is a deficient number, since it is larger than the sum of its proper divisors (2948609).

91101391 is a wasteful number, since it uses less digits than its factorization.

91101391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18905.

The product of its (nonzero) digits is 243, while the sum is 25.

The square root of 91101391 is about 9544.7048670978. The cubic root of 91101391 is about 449.9611340919.

It can be divided in two parts, 9110 and 1391, that added together give a palindrome (10501).

The spelling of 91101391 in words is "ninety-one million, one hundred one thousand, three hundred ninety-one".