91103040 has 168 divisors, whose sum is σ = 358200960. Its totient is φ = 20818944.

The previous prime is 91103039. The next prime is 91103053. The reversal of 91103040 is 4030119.

It is a tau number, because it is divible by the number of its divisors (168).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 17901 + ... + 22419.

Almost surely, 2^91103040 is an apocalyptic number.

91103040 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 91103040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (179100480).

91103040 is an abundant number, since it is smaller than the sum of its proper divisors (267097920).

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

91103040 is a wasteful number, since it uses less digits than its factorization.

91103040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4549 (or 4536 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 18.

The square root of 91103040 is about 9544.7912496817. The cubic root of 91103040 is about 449.9638489477.

Adding to 91103040 its reverse (4030119), we get a palindrome (95133159).

The spelling of 91103040 in words is "ninety-one million, one hundred three thousand, forty".