128611487869 has 2 divisors, whose sum is σ = 128611487870. Its totient is φ = 128611487868.

The previous prime is 128611487857. The next prime is 128611487903. The reversal of 128611487869 is 968784116821.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 93413975769 + 35197512100 = 305637^2 + 187610^2 .

It is a cyclic number.

It is not a de Polignac number, because 128611487869 - 2²¹ = 128609390717 is a prime.

It is a super-2 number, since 2×128611487869² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (128611488869) 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, 64305743934 + 64305743935.

It is an arithmetic number, because the mean of its divisors is an integer number (64305743935).

Almost surely, 2^128611487869 is an apocalyptic number.

It is an amenable number.

128611487869 is a deficient number, since it is larger than the sum of its proper divisors (1).

128611487869 is an equidigital number, since it uses as much as digits as its factorization.

128611487869 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9289728, while the sum is 61.

The spelling of 128611487869 in words is "one hundred twenty-eight billion, six hundred eleven million, four hundred eighty-seven thousand, eight hundred sixty-nine".