11982281 has 4 divisors (see below), whose sum is σ = 12012564. Its totient is φ = 11952000.

The previous prime is 11982277. The next prime is 11982301. The reversal of 11982281 is 18228911.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 18228911 = 1567 ⋅11633.

It can be written as a sum of positive squares in 2 ways, for example, as 7398400 + 4583881 = 2720^2 + 2141^2 .

It is a cyclic number.

It is not a de Polignac number, because 11982281 - 2² = 11982277 is a prime.

It is a super-2 number, since 2×11982281² = 287150115925922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11982211) 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, 14540 + ... + 15341.

It is an arithmetic number, because the mean of its divisors is an integer number (3003141).

Almost surely, 2^11982281 is an apocalyptic number.

It is an amenable number.

11982281 is a deficient number, since it is larger than the sum of its proper divisors (30283).

11982281 is an equidigital number, since it uses as much as digits as its factorization.

11982281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30282.

The product of its digits is 2304, while the sum is 32.

The square root of 11982281 is about 3461.5431529883. The cubic root of 11982281 is about 228.8301086044.

The spelling of 11982281 in words is "eleven million, nine hundred eighty-two thousand, two hundred eighty-one".