84445091 has 2 divisors, whose sum is σ = 84445092. Its totient is φ = 84445090.

The previous prime is 84445079. The next prime is 84445093. The reversal of 84445091 is 19054448.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-84445091 is a prime.

Together with 84445093, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (84445093) 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, 42222545 + 42222546.

It is an arithmetic number, because the mean of its divisors is an integer number (42222546).

Almost surely, 2^84445091 is an apocalyptic number.

84445091 is a deficient number, since it is larger than the sum of its proper divisors (1).

84445091 is an equidigital number, since it uses as much as digits as its factorization.

84445091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 23040, while the sum is 35.

The square root of 84445091 is about 9189.4010142120. The cubic root of 84445091 is about 438.7240773856.

The spelling of 84445091 in words is "eighty-four million, four hundred forty-five thousand, ninety-one".