128790741217 has 4 divisors (see below), whose sum is σ = 130554998020. Its totient is φ = 127026484416.

The previous prime is 128790741193. The next prime is 128790741241. The reversal of 128790741217 is 712147097821.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (128790741193) and next prime (128790741241).

It can be written as a sum of positive squares in 2 ways, for example, as 103215055441 + 25575685776 = 321271^2 + 159924^2 .

It is a cyclic number.

It is not a de Polignac number, because 128790741217 - 2¹¹ = 128790739169 is a prime.

It is a super-3 number, since 3×128790741217³ (a number of 34 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128790741257) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 882128292 + ... + 882128437.

It is an arithmetic number, because the mean of its divisors is an integer number (32638749505).

Almost surely, 2^128790741217 is an apocalyptic number.

It is an amenable number.

128790741217 is a deficient number, since it is larger than the sum of its proper divisors (1764256803).

128790741217 is an equidigital number, since it uses as much as digits as its factorization.

128790741217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1764256802.

The product of its (nonzero) digits is 395136, while the sum is 49.

The spelling of 128790741217 in words is "one hundred twenty-eight billion, seven hundred ninety million, seven hundred forty-one thousand, two hundred seventeen".