11671805 has 4 divisors (see below), whose sum is σ = 14006172. Its totient is φ = 9337440.

The previous prime is 11671799. The next prime is 11671817. The reversal of 11671805 is 50817611.

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 6340324 + 5331481 = 2518^2 + 2309^2 .

It is not a de Polignac number, because 11671805 - 2¹⁶ = 11606269 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 11.

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 3 ways as a sum of consecutive naturals, for example, 1167176 + ... + 1167185.

It is an arithmetic number, because the mean of its divisors is an integer number (3501543).

Almost surely, 2^11671805 is an apocalyptic number.

It is an amenable number.

11671805 is a deficient number, since it is larger than the sum of its proper divisors (2334367).

11671805 is an equidigital number, since it uses as much as digits as its factorization.

11671805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2334366.

The product of its (nonzero) digits is 1680, while the sum is 29.

The square root of 11671805 is about 3416.4023474995. The cubic root of 11671805 is about 226.8363624955.

The spelling of 11671805 in words is "eleven million, six hundred seventy-one thousand, eight hundred five".