84045591 has 12 divisors (see below), whose sum is σ = 138742032.
Its totient is φ = 48026016.
The previous prime is 84045581. The next prime is 84045641. The reversal of 84045591 is 19554048.
It is not a de Polignac number, because 84045591 - 29 = 84045079 is a prime.
It is a super-2 number, since 2×840455912 = 14127322733078562, which contains 22 as substring.
It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (84045581) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (13) of ones.
It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 666966 + ... + 667091.
It is an arithmetic number, because the mean of its divisors is an integer number (11561836).
Almost surely, 284045591 is an apocalyptic number.
84045591 is a deficient number, since it is larger than the sum of its proper divisors (54696441).
84045591 is a wasteful number, since it uses less digits than its factorization.
84045591 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 1334070 (or 1334067 counting only the distinct ones).
The product of its (nonzero) digits is 28800, while the sum is 36.
The square root of 84045591 is about 9167.6382454807.
The cubic root of 84045591 is about 438.0311324590.
The spelling of 84045591 in words is "eighty-four million, forty-five thousand, five hundred ninety-one".