91013120 has 120 divisors (see below), whose sum is σ = 240640848. Its totient is φ = 32768000.

The previous prime is 91013113. The next prime is 91013129. The reversal of 91013120 is 2131019.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (91013129) 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, 901070 + ... + 901170.

Almost surely, 2^91013120 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 91013120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (120320424).

91013120 is an abundant number, since it is smaller than the sum of its proper divisors (149627728).

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

91013120 is a wasteful number, since it uses less digits than its factorization.

91013120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145 (or 119 counting only the distinct ones).

The product of its (nonzero) digits is 54, while the sum is 17.

The square root of 91013120 is about 9540.0796642376. The cubic root of 91013120 is about 449.8157599693.

Adding to 91013120 its reverse (2131019), we get a palindrome (93144139).

It can be divided in two parts, 9101 and 3120, that added together give a palindrome (12221).

The spelling of 91013120 in words is "ninety-one million, thirteen thousand, one hundred twenty".