84788521 has 2 divisors, whose sum is σ = 84788522. Its totient is φ = 84788520.

The previous prime is 84788519. The next prime is 84788569. The reversal of 84788521 is 12588748.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 74580496 + 10208025 = 8636^2 + 3195^2 .

It is a cyclic number.

It is not a de Polignac number, because 84788521 - 2¹ = 84788519 is a prime.

Together with 84788519, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (84783521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42394260 + 42394261.

It is an arithmetic number, because the mean of its divisors is an integer number (42394261).

Almost surely, 2^84788521 is an apocalyptic number.

It is an amenable number.

84788521 is a deficient number, since it is larger than the sum of its proper divisors (1).

84788521 is an equidigital number, since it uses as much as digits as its factorization.

84788521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 143360, while the sum is 43.

The square root of 84788521 is about 9208.0682556115. The cubic root of 84788521 is about 439.3180223722.

The spelling of 84788521 in words is "eighty-four million, seven hundred eighty-eight thousand, five hundred twenty-one".