11162281 has 9 divisors (see below), whose sum is σ = 12134181. Its totient is φ = 10263552.

The previous prime is 11162279. The next prime is 11162287. The reversal of 11162281 is 18226111.

The square root of 11162281 is 3341.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 793881 + 10368400 = 891^2 + 3220^2 .

It is not a de Polignac number, because 11162281 - 2¹ = 11162279 is a prime.

It is a super-2 number, since 2×11162281² = 249193034245922, which contains 22 as substring.

It is a Duffinian number.

It is a nialpdrome in base 15.

It is not an unprimeable number, because it can be changed into a prime (11162287) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 43305 + ... + 43561.

Almost surely, 2^11162281 is an apocalyptic number.

11162281 is the 3341-st square number.

11162281 is the 1671-st centered octagonal number.

It is an amenable number.

11162281 is a deficient number, since it is larger than the sum of its proper divisors (971900).

11162281 is an frugal number, since it uses more digits than its factorization.

11162281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 540 (or 270 counting only the distinct ones).

The product of its digits is 192, while the sum is 22.

The cubic root of 11162281 is about 223.4863402876.

Adding to 11162281 its reverse (18226111), we get a palindrome (29388392).

The spelling of 11162281 in words is "eleven million, one hundred sixty-two thousand, two hundred eighty-one".