91226783172 has 96 divisors (see below), whose sum is σ = 251625314304. Its totient is φ = 25182086400.

The previous prime is 91226783159. The next prime is 91226783173. The reversal of 91226783172 is 27138762219.

It is a happy number.

It is a super-2 number, since 2×91226783172² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (91226783173) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 226147 + ... + 483317.

It is an arithmetic number, because the mean of its divisors is an integer number (2621097024).

Almost surely, 2^91226783172 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 91226783172, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (125812657152).

91226783172 is an abundant number, since it is smaller than the sum of its proper divisors (160398531132).

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

91226783172 is a wasteful number, since it uses less digits than its factorization.

91226783172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 257329 (or 257327 counting only the distinct ones).

The product of its digits is 508032, while the sum is 48.

The spelling of 91226783172 in words is "ninety-one billion, two hundred twenty-six million, seven hundred eighty-three thousand, one hundred seventy-two".