11640081 has 8 divisors (see below), whose sum is σ = 15774784. Its totient is φ = 7632720.

The previous prime is 11640077. The next prime is 11640091. The reversal of 11640081 is 18004611.

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

It is not a de Polignac number, because 11640081 - 2² = 11640077 is a prime.

It is a super-2 number, since 2×11640081² = 270982971373122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11640061) 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 7 ways as a sum of consecutive naturals, for example, 31621 + ... + 31986.

It is an arithmetic number, because the mean of its divisors is an integer number (1971848).

Almost surely, 2^11640081 is an apocalyptic number.

It is an amenable number.

11640081 is a deficient number, since it is larger than the sum of its proper divisors (4134703).

11640081 is an equidigital number, since it uses as much as digits as its factorization.

11640081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63671.

The product of its (nonzero) digits is 192, while the sum is 21.

The square root of 11640081 is about 3411.7562925860. The cubic root of 11640081 is about 226.6306620532.

Adding to 11640081 its reverse (18004611), we get a palindrome (29644692).

The spelling of 11640081 in words is "eleven million, six hundred forty thousand, eighty-one".