11811005 has 16 divisors (see below), whose sum is σ = 15090624. Its totient is φ = 8843520.

The previous prime is 11811001. The next prime is 11811043. The reversal of 11811005 is 50011811.

It is not a de Polignac number, because 11811005 - 2² = 11811001 is a prime.

It is a super-2 number, since 2×11811005² = 278999678220050, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11811001) 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 15 ways as a sum of consecutive naturals, for example, 23810 + ... + 24300.

It is an arithmetic number, because the mean of its divisors is an integer number (943164).

Almost surely, 2^11811005 is an apocalyptic number.

It is an amenable number.

11811005 is a deficient number, since it is larger than the sum of its proper divisors (3279619).

11811005 is a wasteful number, since it uses less digits than its factorization.

11811005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 796.

The product of its (nonzero) digits is 40, while the sum is 17.

The square root of 11811005 is about 3436.7142738377. The cubic root of 11811005 is about 227.7345646535.

Adding to 11811005 its reverse (50011811), we get a palindrome (61822816).

The spelling of 11811005 in words is "eleven million, eight hundred eleven thousand, five".