11090581 has 4 divisors (see below), whose sum is σ = 11105100. Its totient is φ = 11076064.

The previous prime is 11090503. The next prime is 11090609. The reversal of 11090581 is 18509011.

11090581 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 9672100 + 1418481 = 3110^2 + 1191^2 .

It is a cyclic number.

It is not a de Polignac number, because 11090581 - 2¹⁹ = 10566293 is a prime.

It is a super-2 number, since 2×11090581² = 246001973835122, 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 (11090081) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6046 + ... + 7663.

It is an arithmetic number, because the mean of its divisors is an integer number (2776275).

Almost surely, 2^11090581 is an apocalyptic number.

It is an amenable number.

11090581 is a deficient number, since it is larger than the sum of its proper divisors (14519).

11090581 is an equidigital number, since it uses as much as digits as its factorization.

11090581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14518.

The product of its (nonzero) digits is 360, while the sum is 25.

The square root of 11090581 is about 3330.2523928375. The cubic root of 11090581 is about 223.0067966317.

Adding to 11090581 its reverse (18509011), we get a palindrome (29599592).

The spelling of 11090581 in words is "eleven million, ninety thousand, five hundred eighty-one".