128113931609 has 2 divisors, whose sum is σ = 128113931610. Its totient is φ = 128113931608.

The previous prime is 128113931587. The next prime is 128113931653. The reversal of 128113931609 is 906139311821.

It is an a-pointer prime, because the next prime (128113931653) can be obtained adding 128113931609 to its sum of digits (44).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 96517091584 + 31596840025 = 310672^2 + 177755^2 .

It is a cyclic number.

It is not a de Polignac number, because 128113931609 - 2²⁰ = 128112883033 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 128113931609.

It is not a weakly prime, because it can be changed into another prime (128113934609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64056965804 + 64056965805.

It is an arithmetic number, because the mean of its divisors is an integer number (64056965805).

Almost surely, 2^128113931609 is an apocalyptic number.

It is an amenable number.

128113931609 is a deficient number, since it is larger than the sum of its proper divisors (1).

128113931609 is an equidigital number, since it uses as much as digits as its factorization.

128113931609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 69984, while the sum is 44.

The spelling of 128113931609 in words is "one hundred twenty-eight billion, one hundred thirteen million, nine hundred thirty-one thousand, six hundred nine".