84130742809 has 9 divisors (see below), whose sum is σ = 87954612949. Its totient is φ = 80466503260.

The previous prime is 84130742747. The next prime is 84130742819. The reversal of 84130742809 is 90824703148.

The square root of 84130742809 is 290053.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 84130742809 - 2¹⁹ = 84130218521 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (84130742819) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 6664914 + ... + 6677524.

Almost surely, 2^84130742809 is an apocalyptic number.

84130742809 is the 290053-rd square number.

84130742809 is the 145027-th centered octagonal number.

It is an amenable number.

84130742809 is a deficient number, since it is larger than the sum of its proper divisors (3823870140).

84130742809 is an frugal number, since it uses more digits than its factorization.

84130742809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25268 (or 12634 counting only the distinct ones).

The product of its (nonzero) digits is 387072, while the sum is 46.

The spelling of 84130742809 in words is "eighty-four billion, one hundred thirty million, seven hundred forty-two thousand, eight hundred nine".