11512005 has 32 divisors (see below), whose sum is σ = 20029440. Its totient is φ = 5624640.

The previous prime is 11511989. The next prime is 11512013. The reversal of 11512005 is 50021511.

It is not a de Polignac number, because 11512005 - 2⁴ = 11511989 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 8184 + ... + 9486.

It is an arithmetic number, because the mean of its divisors is an integer number (625920).

Almost surely, 2^11512005 is an apocalyptic number.

11512005 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

11512005 is a deficient number, since it is larger than the sum of its proper divisors (8517435).

11512005 is a wasteful number, since it uses less digits than its factorization.

11512005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1361.

The product of its (nonzero) digits is 50, while the sum is 15.

The square root of 11512005 is about 3392.9345705451. The cubic root of 11512005 is about 225.7963877356.

Adding to 11512005 its reverse (50021511), we get a palindrome (61533516).

The spelling of 11512005 in words is "eleven million, five hundred twelve thousand, five".