91611520 has 288 divisors, whose sum is σ = 297909360. Its totient is φ = 26357760.

The previous prime is 91611511. The next prime is 91611523. The reversal of 91611520 is 2511619.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91611523) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 7047034 + ... + 7047046.

Almost surely, 2^91611520 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 91611520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (148954680).

91611520 is an abundant number, since it is smaller than the sum of its proper divisors (206297840).

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

91611520 is a wasteful number, since it uses less digits than its factorization.

91611520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74 (or 38 counting only the distinct ones).

The product of its (nonzero) digits is 540, while the sum is 25.

The square root of 91611520 is about 9571.3907035498. The cubic root of 91611520 is about 450.7994349123.

The spelling of 91611520 in words is "ninety-one million, six hundred eleven thousand, five hundred twenty".