128027117149 has 4 divisors (see below), whose sum is σ = 128070475036. Its totient is φ = 127983759264.

The previous prime is 128027117123. The next prime is 128027117167. The reversal of 128027117149 is 941711720821.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 941711720821 = 895079 ⋅1052099.

It can be written as a sum of positive squares in 2 ways, for example, as 120577701049 + 7449416100 = 347243^2 + 86310^2 .

It is a cyclic number.

It is not a de Polignac number, because 128027117149 - 2¹⁹ = 128026592861 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128027117549) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21674514 + ... + 21680419.

It is an arithmetic number, because the mean of its divisors is an integer number (32017618759).

Almost surely, 2^128027117149 is an apocalyptic number.

It is an amenable number.

128027117149 is a deficient number, since it is larger than the sum of its proper divisors (43357887).

128027117149 is an equidigital number, since it uses as much as digits as its factorization.

128027117149 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43357886.

The product of its (nonzero) digits is 56448, while the sum is 43.

The spelling of 128027117149 in words is "one hundred twenty-eight billion, twenty-seven million, one hundred seventeen thousand, one hundred forty-nine".