91169406 has 48 divisors (see below), whose sum is σ = 203970624. Its totient is φ = 29408832.

The previous prime is 91169399. The next prime is 91169411. The reversal of 91169406 is 60496119.

91169406 is a `hidden beast` number, since 91 + 169 + 406 = 666.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 244236 + ... + 244608.

It is an arithmetic number, because the mean of its divisors is an integer number (4249388).

Almost surely, 2^91169406 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 91169406, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (101985312).

91169406 is an abundant number, since it is smaller than the sum of its proper divisors (112801218).

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

91169406 is a wasteful number, since it uses less digits than its factorization.

91169406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 785 (or 782 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 36.

The square root of 91169406 is about 9548.2671726340. The cubic root of 91169406 is about 450.0730844260.

The spelling of 91169406 in words is "ninety-one million, one hundred sixty-nine thousand, four hundred six".