11279581 has 4 divisors (see below), whose sum is σ = 11315932. Its totient is φ = 11243232.

The previous prime is 11279539. The next prime is 11279599. The reversal of 11279581 is 18597211.

It is a happy number.

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 448900 + 10830681 = 670^2 + 3291^2 .

It is a cyclic number.

It is not a de Polignac number, because 11279581 - 2¹⁵ = 11246813 is a prime.

It is a super-2 number, since 2×11279581² = 254457895071122, 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 (11279981) by changing a digit.

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, 17706 + ... + 18331.

It is an arithmetic number, because the mean of its divisors is an integer number (2828983).

Almost surely, 2^11279581 is an apocalyptic number.

It is an amenable number.

11279581 is a deficient number, since it is larger than the sum of its proper divisors (36351).

11279581 is an equidigital number, since it uses as much as digits as its factorization.

11279581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36350.

The product of its digits is 5040, while the sum is 34.

The square root of 11279581 is about 3358.5087464528. The cubic root of 11279581 is about 224.2664572004.

The spelling of 11279581 in words is "eleven million, two hundred seventy-nine thousand, five hundred eighty-one".