84445591 has 2 divisors, whose sum is σ = 84445592. Its totient is φ = 84445590.

The previous prime is 84445583. The next prime is 84445607. The reversal of 84445591 is 19554448.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 84445591 - 2³ = 84445583 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (84445541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42222795 + 42222796.

It is an arithmetic number, because the mean of its divisors is an integer number (42222796).

Almost surely, 2^84445591 is an apocalyptic number.

84445591 is a deficient number, since it is larger than the sum of its proper divisors (1).

84445591 is an equidigital number, since it uses as much as digits as its factorization.

84445591 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 115200, while the sum is 40.

The square root of 84445591 is about 9189.4282194269. The cubic root of 84445591 is about 438.7249432800.

The spelling of 84445591 in words is "eighty-four million, four hundred forty-five thousand, five hundred ninety-one".