128134702081 has 4 divisors (see below), whose sum is σ = 128135420500. Its totient is φ = 128133983664.

The previous prime is 128134702063. The next prime is 128134702139. The reversal of 128134702081 is 180207431821.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 85746480625 + 42388221456 = 292825^2 + 205884^2 .

It is a cyclic number.

It is not a de Polignac number, because 128134702081 - 2¹³ = 128134693889 is a prime.

It is a super-2 number, since 2×128134702081² (a number of 23 digits) contains 22 as substring.

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 128134702081.

It is not an unprimeable number, because it can be changed into a prime (128134702051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 134695 + ... + 523843.

It is an arithmetic number, because the mean of its divisors is an integer number (32033855125).

Almost surely, 2^128134702081 is an apocalyptic number.

It is an amenable number.

128134702081 is a deficient number, since it is larger than the sum of its proper divisors (718419).

128134702081 is an equidigital number, since it uses as much as digits as its factorization.

128134702081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 718418.

The product of its (nonzero) digits is 21504, while the sum is 37.

The spelling of 128134702081 in words is "one hundred twenty-eight billion, one hundred thirty-four million, seven hundred two thousand, eighty-one".