11228128129 has 4 divisors (see below), whose sum is σ = 11228801584. Its totient is φ = 11227454676.

The previous prime is 11228128123. The next prime is 11228128133. The reversal of 11228128129 is 92182182211.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 11228128129 - 2¹¹ = 11228126081 is a prime.

It is a super-2 number, since 2×11228128129² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11228128123) 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, 311067 + ... + 345280.

It is an arithmetic number, because the mean of its divisors is an integer number (2807200396).

Almost surely, 2^11228128129 is an apocalyptic number.

It is an amenable number.

11228128129 is a deficient number, since it is larger than the sum of its proper divisors (673455).

11228128129 is an equidigital number, since it uses as much as digits as its factorization.

11228128129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 673454.

The product of its digits is 9216, while the sum is 37.

The spelling of 11228128129 in words is "eleven billion, two hundred twenty-eight million, one hundred twenty-eight thousand, one hundred twenty-nine".