128518139441 has 2 divisors, whose sum is σ = 128518139442. Its totient is φ = 128518139440.

The previous prime is 128518139417. The next prime is 128518139483. The reversal of 128518139441 is 144931815821.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 125503690225 + 3014449216 = 354265^2 + 54904^2 .

It is a cyclic number.

It is not a de Polignac number, because 128518139441 - 2¹⁰ = 128518138417 is a prime.

It is not a weakly prime, because it can be changed into another prime (128518139041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64259069720 + 64259069721.

It is an arithmetic number, because the mean of its divisors is an integer number (64259069721).

Almost surely, 2^128518139441 is an apocalyptic number.

It is an amenable number.

128518139441 is a deficient number, since it is larger than the sum of its proper divisors (1).

128518139441 is an equidigital number, since it uses as much as digits as its factorization.

128518139441 is an evil number, because the sum of its binary digits is even.

The product of its digits is 276480, while the sum is 47.

The spelling of 128518139441 in words is "one hundred twenty-eight billion, five hundred eighteen million, one hundred thirty-nine thousand, four hundred forty-one".