11056981 has 4 divisors (see below), whose sum is σ = 11907532. Its totient is φ = 10206432.

The previous prime is 11056979. The next prime is 11056999. The reversal of 11056981 is 18965011.

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 2588881 + 8468100 = 1609^2 + 2910^2 .

It is a cyclic number.

It is not a de Polignac number, because 11056981 - 2¹ = 11056979 is a prime.

It is a super-2 number, since 2×11056981² = 244513657668722, which contains 22 as substring.

It is a nialpdrome in base 15.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11056931) 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, 425256 + ... + 425281.

It is an arithmetic number, because the mean of its divisors is an integer number (2976883).

Almost surely, 2^11056981 is an apocalyptic number.

It is an amenable number.

11056981 is a deficient number, since it is larger than the sum of its proper divisors (850551).

11056981 is an equidigital number, since it uses as much as digits as its factorization.

11056981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 850550.

The product of its (nonzero) digits is 2160, while the sum is 31.

The square root of 11056981 is about 3325.2039035223. The cubic root of 11056981 is about 222.7813618511.

The spelling of 11056981 in words is "eleven million, fifty-six thousand, nine hundred eighty-one".