11057581 has 4 divisors (see below), whose sum is σ = 11167164. Its totient is φ = 10948000.

The previous prime is 11057573. The next prime is 11057587. The reversal of 11057581 is 18575011.

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 6584356 + 4473225 = 2566^2 + 2115^2 .

It is a cyclic number.

It is not a de Polignac number, because 11057581 - 2³ = 11057573 is a prime.

It is a super-2 number, since 2×11057581² = 244540195143122, 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 (11057587) 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, 54640 + ... + 54841.

It is an arithmetic number, because the mean of its divisors is an integer number (2791791).

Almost surely, 2^11057581 is an apocalyptic number.

It is an amenable number.

11057581 is a deficient number, since it is larger than the sum of its proper divisors (109583).

11057581 is a wasteful number, since it uses less digits than its factorization.

11057581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109582.

The product of its (nonzero) digits is 1400, while the sum is 28.

The square root of 11057581 is about 3325.2941223296. The cubic root of 11057581 is about 222.7853914743.

The spelling of 11057581 in words is "eleven million, fifty-seven thousand, five hundred eighty-one".