128252999081 has 2 divisors, whose sum is σ = 128252999082. Its totient is φ = 128252999080.

The previous prime is 128252999051. The next prime is 128252999087. The reversal of 128252999081 is 180999252821.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 125021645056 + 3231354025 = 353584^2 + 56845^2 .

It is a cyclic number.

It is not a de Polignac number, because 128252999081 - 2¹⁰ = 128252998057 is a prime.

It is a super-2 number, since 2×128252999081² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (128252999087) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64126499540 + 64126499541.

It is an arithmetic number, because the mean of its divisors is an integer number (64126499541).

Almost surely, 2^128252999081 is an apocalyptic number.

It is an amenable number.

128252999081 is a deficient number, since it is larger than the sum of its proper divisors (1).

128252999081 is an equidigital number, since it uses as much as digits as its factorization.

128252999081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1866240, while the sum is 56.

The spelling of 128252999081 in words is "one hundred twenty-eight billion, two hundred fifty-two million, nine hundred ninety-nine thousand, eighty-one".