128011013 has 4 divisors (see below), whose sum is σ = 137858028. Its totient is φ = 118164000.

The previous prime is 128010991. The next prime is 128011063. The reversal of 128011013 is 310110821.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 310110821 = 17 ⋅18241813.

It can be written as a sum of positive squares in 2 ways, for example, as 34656769 + 93354244 = 5887^2 + 9662^2 .

It is a cyclic number.

It is not a de Polignac number, because 128011013 - 2²² = 123816709 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 128010982 and 128011000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128011063) 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, 4923488 + ... + 4923513.

It is an arithmetic number, because the mean of its divisors is an integer number (34464507).

Almost surely, 2^128011013 is an apocalyptic number.

128011013 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

128011013 is a deficient number, since it is larger than the sum of its proper divisors (9847015).

128011013 is an equidigital number, since it uses as much as digits as its factorization.

128011013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9847014.

The product of its (nonzero) digits is 48, while the sum is 17.

The square root of 128011013 is about 11314.1951989525. The cubic root of 128011013 is about 503.9828732002.

Adding to 128011013 its reverse (310110821), we get a palindrome (438121834).

The spelling of 128011013 in words is "one hundred twenty-eight million, eleven thousand, thirteen".