84524557 has 4 divisors (see below), whose sum is σ = 91026460. Its totient is φ = 78022656.

The previous prime is 84524551. The next prime is 84524593. The reversal of 84524557 is 75542548.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 8590761 + 75933796 = 2931^2 + 8714^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-84524557 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (84524551) 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 3 ways as a sum of consecutive naturals, for example, 3250932 + ... + 3250957.

It is an arithmetic number, because the mean of its divisors is an integer number (22756615).

Almost surely, 2^84524557 is an apocalyptic number.

It is an amenable number.

84524557 is a deficient number, since it is larger than the sum of its proper divisors (6501903).

84524557 is a wasteful number, since it uses less digits than its factorization.

84524557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6501902.

The product of its digits is 224000, while the sum is 40.

The square root of 84524557 is about 9193.7237831033. The cubic root of 84524557 is about 438.8616528476.

Subtracting from 84524557 its reverse (75542548), we obtain a square (8982009 = 2997²).

The spelling of 84524557 in words is "eighty-four million, five hundred twenty-four thousand, five hundred fifty-seven".