84988591 has 2 divisors, whose sum is σ = 84988592. Its totient is φ = 84988590.

The previous prime is 84988567. The next prime is 84988619. The reversal of 84988591 is 19588948.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 84988591 - 2¹¹ = 84986543 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (84988291) 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 as a sum of consecutive naturals, namely, 42494295 + 42494296.

It is an arithmetic number, because the mean of its divisors is an integer number (42494296).

Almost surely, 2^84988591 is an apocalyptic number.

84988591 is a deficient number, since it is larger than the sum of its proper divisors (1).

84988591 is an equidigital number, since it uses as much as digits as its factorization.

84988591 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 829440, while the sum is 52.

The square root of 84988591 is about 9218.9256966308. The cubic root of 84988591 is about 439.6632944024.

The spelling of 84988591 in words is "eighty-four million, nine hundred eighty-eight thousand, five hundred ninety-one".