91561104 has 200 divisors, whose sum is σ = 285196032. Its totient is φ = 28304640.

The previous prime is 91561027. The next prime is 91561109. The reversal of 91561104 is 40116519.

91561104 is a `hidden beast` number, since 91 + 561 + 10 + 4 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (91561109) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 1727542 + ... + 1727594.

Almost surely, 2^91561104 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 91561104, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (142598016).

91561104 is an abundant number, since it is smaller than the sum of its proper divisors (193634928).

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

91561104 is a wasteful number, since it uses less digits than its factorization.

91561104 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 147 (or 132 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 27.

The square root of 91561104 is about 9568.7566590441. The cubic root of 91561104 is about 450.7167245183.

The spelling of 91561104 in words is "ninety-one million, five hundred sixty-one thousand, one hundred four".