84138055289 has 4 divisors (see below), whose sum is σ = 84574003956. Its totient is φ = 83702106624.

The previous prime is 84138055277. The next prime is 84138055303. The reversal of 84138055289 is 98255083148.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 58318386064 + 25819669225 = 241492^2 + 160685^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-84138055289 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 84138055289.

It is not an unprimeable number, because it can be changed into a prime (84138055259) 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 in 3 ways as a sum of consecutive naturals, for example, 217974044 + ... + 217974429.

It is an arithmetic number, because the mean of its divisors is an integer number (21143500989).

Almost surely, 2^84138055289 is an apocalyptic number.

It is an amenable number.

84138055289 is a deficient number, since it is larger than the sum of its proper divisors (435948667).

84138055289 is a wasteful number, since it uses less digits than its factorization.

84138055289 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 435948666.

The product of its (nonzero) digits is 2764800, while the sum is 53.

The spelling of 84138055289 in words is "eighty-four billion, one hundred thirty-eight million, fifty-five thousand, two hundred eighty-nine".