128131956013 has 2 divisors, whose sum is σ = 128131956014. Its totient is φ = 128131956012.

The previous prime is 128131955999. The next prime is 128131956031. The reversal of 128131956013 is 310659131821.

Together with next prime (128131956031) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 127308380809 + 823575204 = 356803^2 + 28698^2 .

It is a cyclic number.

It is not a de Polignac number, because 128131956013 - 2²¹ = 128129858861 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (128131956913) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64065978006 + 64065978007.

It is an arithmetic number, because the mean of its divisors is an integer number (64065978007).

Almost surely, 2^128131956013 is an apocalyptic number.

It is an amenable number.

128131956013 is a deficient number, since it is larger than the sum of its proper divisors (1).

128131956013 is an equidigital number, since it uses as much as digits as its factorization.

128131956013 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 38880, while the sum is 40.

The spelling of 128131956013 in words is "one hundred twenty-eight billion, one hundred thirty-one million, nine hundred fifty-six thousand, thirteen".