11671809 has 8 divisors (see below), whose sum is σ = 16477920. Its totient is φ = 7323456.

The previous prime is 11671799. The next prime is 11671817. The reversal of 11671809 is 90817611.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 11671809 - 2¹¹ = 11669761 is a prime.

It is a super-2 number, since 2×11671809² = 272462250664962, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 11671809.

It is not an unprimeable number, because it can be changed into a prime (11671859) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 114379 + ... + 114480.

It is an arithmetic number, because the mean of its divisors is an integer number (2059740).

Almost surely, 2^11671809 is an apocalyptic number.

It is an amenable number.

11671809 is a deficient number, since it is larger than the sum of its proper divisors (4806111).

11671809 is a wasteful number, since it uses less digits than its factorization.

11671809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 228879.

The product of its (nonzero) digits is 3024, while the sum is 33.

The square root of 11671809 is about 3416.4029329106. The cubic root of 11671809 is about 226.8363884082.

The spelling of 11671809 in words is "eleven million, six hundred seventy-one thousand, eight hundred nine".