11662581 has 8 divisors (see below), whose sum is σ = 17771584. Its totient is φ = 6664320.

The previous prime is 11662577. The next prime is 11662583. The reversal of 11662581 is 18526611.

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

It is not a de Polignac number, because 11662581 - 2² = 11662577 is a prime.

It is a super-2 number, since 2×11662581² = 272031591163122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11662583) 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, 277660 + ... + 277701.

It is an arithmetic number, because the mean of its divisors is an integer number (2221448).

Almost surely, 2^11662581 is an apocalyptic number.

It is an amenable number.

11662581 is a deficient number, since it is larger than the sum of its proper divisors (6109003).

11662581 is an equidigital number, since it uses as much as digits as its factorization.

11662581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 555371.

The product of its digits is 2880, while the sum is 30.

The square root of 11662581 is about 3415.0521225891. The cubic root of 11662581 is about 226.7765919622.

The spelling of 11662581 in words is "eleven million, six hundred sixty-two thousand, five hundred eighty-one".