11506505 has 4 divisors (see below), whose sum is σ = 13807812. Its totient is φ = 9205200.

The previous prime is 11506489. The next prime is 11506507. The reversal of 11506505 is 50560511.

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 4048144 + 7458361 = 2012^2 + 2731^2 .

It is not a de Polignac number, because 11506505 - 2⁴ = 11506489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11506507) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1150646 + ... + 1150655.

It is an arithmetic number, because the mean of its divisors is an integer number (3451953).

Almost surely, 2^11506505 is an apocalyptic number.

It is an amenable number.

11506505 is a deficient number, since it is larger than the sum of its proper divisors (2301307).

11506505 is an equidigital number, since it uses as much as digits as its factorization.

11506505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2301306.

The product of its (nonzero) digits is 750, while the sum is 23.

The square root of 11506505 is about 3392.1239658951. The cubic root of 11506505 is about 225.7604230199.

The spelling of 11506505 in words is "eleven million, five hundred six thousand, five hundred five".