11809051 has 16 divisors (see below), whose sum is σ = 13213440. Its totient is φ = 10501920.

The previous prime is 11809043. The next prime is 11809081. The reversal of 11809051 is 15090811.

11809051 = 484² + 485² + ... + 529².

It is a cyclic number.

It is not a de Polignac number, because 11809051 - 2³ = 11809043 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11809001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26436 + ... + 26878.

It is an arithmetic number, because the mean of its divisors is an integer number (825840).

Almost surely, 2^11809051 is an apocalyptic number.

11809051 is the 2806-th pentagonal number.

11809051 is a deficient number, since it is larger than the sum of its proper divisors (1404389).

11809051 is a wasteful number, since it uses less digits than its factorization.

11809051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 546.

The product of its (nonzero) digits is 360, while the sum is 25.

The square root of 11809051 is about 3436.4299789171. The cubic root of 11809051 is about 227.7220052402.

Adding to 11809051 its reverse (15090811), we get a palindrome (26899862).

The spelling of 11809051 in words is "eleven million, eight hundred nine thousand, fifty-one".