11156081 has 6 divisors (see below), whose sum is σ = 11662770. Its totient is φ = 10670528.

The previous prime is 11156071. The next prime is 11156099. The reversal of 11156081 is 18065111.

It is a happy number.

11156081 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 11122225 + 33856 = 3335^2 + 184^2 .

It is not a de Polignac number, because 11156081 - 2²² = 6961777 is a prime.

It is a super-2 number, since 2×11156081² = 248916286557122, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (11156051) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 10016 + ... + 11073.

It is an arithmetic number, because the mean of its divisors is an integer number (1943795).

Almost surely, 2^11156081 is an apocalyptic number.

It is an amenable number.

11156081 is a deficient number, since it is larger than the sum of its proper divisors (506689).

11156081 is an equidigital number, since it uses as much as digits as its factorization.

11156081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21135 (or 21112 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 23.

The square root of 11156081 is about 3340.0720052119. The cubic root of 11156081 is about 223.4449547222. Note that the first 3 decimals are identical.

The spelling of 11156081 in words is "eleven million, one hundred fifty-six thousand, eighty-one".