91163120 has 20 divisors (see below), whose sum is σ = 211954440. Its totient is φ = 36465216.

The previous prime is 91163113. The next prime is 91163123. The reversal of 91163120 is 2136119.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91163123) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 569690 + ... + 569849.

It is an arithmetic number, because the mean of its divisors is an integer number (10597722).

Almost surely, 2^91163120 is an apocalyptic number.

It is an amenable number.

91163120 is an abundant number, since it is smaller than the sum of its proper divisors (120791320).

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

91163120 is a wasteful number, since it uses less digits than its factorization.

91163120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1139552 (or 1139546 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 23.

The square root of 91163120 is about 9547.9379972851. The cubic root of 91163120 is about 450.0627402234.

Adding to 91163120 its reverse (2136119), we get a palindrome (93299239).

The spelling of 91163120 in words is "ninety-one million, one hundred sixty-three thousand, one hundred twenty".