11128505 has 4 divisors (see below), whose sum is σ = 13354212. Its totient is φ = 8902800.

The previous prime is 11128501. The next prime is 11128517. The reversal of 11128505 is 50582111.

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

It can be written as a sum of positive squares in 2 ways, for example, as 6497401 + 4631104 = 2549^2 + 2152^2 .

It is not a de Polignac number, because 11128505 - 2² = 11128501 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11128501) 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, 1112846 + ... + 1112855.

It is an arithmetic number, because the mean of its divisors is an integer number (3338553).

Almost surely, 2^11128505 is an apocalyptic number.

It is an amenable number.

11128505 is a deficient number, since it is larger than the sum of its proper divisors (2225707).

11128505 is an equidigital number, since it uses as much as digits as its factorization.

11128505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2225706.

The product of its (nonzero) digits is 400, while the sum is 23.

The square root of 11128505 is about 3335.9413963677. The cubic root of 11128505 is about 223.2606964098.

The spelling of 11128505 in words is "eleven million, one hundred twenty-eight thousand, five hundred five".