128130350209 has 9 divisors (see below), whose sum is σ = 130360346337. Its totient is φ = 125937888084.

The previous prime is 128130350189. The next prime is 128130350261. The reversal of 128130350209 is 902053031821.

The square root of 128130350209 is 357953.

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

It is not a de Polignac number, because 128130350209 - 2⁵ = 128130350177 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128130320209) 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, 21116194 + ... + 21122260.

Almost surely, 2^128130350209 is an apocalyptic number.

128130350209 is the 357953-rd square number.

128130350209 is the 178977-th centered octagonal number.

It is an amenable number.

128130350209 is a deficient number, since it is larger than the sum of its proper divisors (2229996128).

128130350209 is an frugal number, since it uses more digits than its factorization.

128130350209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12252 (or 6126 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 34.

The spelling of 128130350209 in words is "one hundred twenty-eight billion, one hundred thirty million, three hundred fifty thousand, two hundred nine".