84057428909 has 2 divisors, whose sum is σ = 84057428910. Its totient is φ = 84057428908.

The previous prime is 84057428891. The next prime is 84057428921. The reversal of 84057428909 is 90982475048.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 68680684900 + 15376744009 = 262070^2 + 124003^2 .

It is a cyclic number.

It is not a de Polignac number, because 84057428909 - 2²⁴ = 84040651693 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (84057428809) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42028714454 + 42028714455.

It is an arithmetic number, because the mean of its divisors is an integer number (42028714455).

Almost surely, 2^84057428909 is an apocalyptic number.

It is an amenable number.

84057428909 is a deficient number, since it is larger than the sum of its proper divisors (1).

84057428909 is an equidigital number, since it uses as much as digits as its factorization.

84057428909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5806080, while the sum is 56.

The spelling of 84057428909 in words is "eighty-four billion, fifty-seven million, four hundred twenty-eight thousand, nine hundred nine".