91479417174 has 72 divisors (see below), whose sum is σ = 206289374760. Its totient is φ = 30049362720.

The previous prime is 91479417163. The next prime is 91479417191. The reversal of 91479417174 is 47171497419.

91479417174 is a `hidden beast` number, since 91 + 4 + 79 + 417 + 1 + 74 = 666.

It is a super-2 number, since 2×91479417174² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 91479417174.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 175584034 + ... + 175584554.

It is an arithmetic number, because the mean of its divisors is an integer number (2865130205).

Almost surely, 2^91479417174 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 91479417174, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (103144687380).

91479417174 is an abundant number, since it is smaller than the sum of its proper divisors (114809957586).

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

91479417174 is an frugal number, since it uses more digits than its factorization.

91479417174 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1211 (or 605 counting only the distinct ones).

The product of its digits is 1778112, while the sum is 54.

Multiplying 91479417174 by its sum of digits (54), we get a square (4939888527396 = 2222586²).

91479417174 divided by its sum of digits (54) gives a square (1694063281 = 41159²).

The spelling of 91479417174 in words is "ninety-one billion, four hundred seventy-nine million, four hundred seventeen thousand, one hundred seventy-four".