91001120 has 96 divisors (see below), whose sum is σ = 253725696. Its totient is φ = 30182400.

The previous prime is 91001111. The next prime is 91001123. The reversal of 91001120 is 2110019.

It is a Harshad number since it is a multiple of its sum of digits (14).

It is a junction number, because it is equal to n+sod(n) for n = 91001095 and 91001104.

It is not an unprimeable number, because it can be changed into a prime (91001123) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 33410 + ... + 36030.

It is an arithmetic number, because the mean of its divisors is an integer number (2642976).

Almost surely, 2^91001120 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 91001120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (126862848).

91001120 is an abundant number, since it is smaller than the sum of its proper divisors (162724576).

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

91001120 is a wasteful number, since it uses less digits than its factorization.

91001120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2674 (or 2666 counting only the distinct ones).

The product of its (nonzero) digits is 18, while the sum is 14.

The square root of 91001120 is about 9539.4507179397. The cubic root of 91001120 is about 449.7959898293.

Adding to 91001120 its reverse (2110019), we get a palindrome (93111139).

The spelling of 91001120 in words is "ninety-one million, one thousand, one hundred twenty".