11388281 has 4 divisors (see below), whose sum is σ = 11396352. Its totient is φ = 11380212.

The previous prime is 11388263. The next prime is 11388319. The reversal of 11388281 is 18288311.

It is a happy number.

11388281 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11388281 is a prime.

It is a super-2 number, since 2×11388281² = 259385888269922, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (11387281) 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, 1301 + ... + 4946.

It is an arithmetic number, because the mean of its divisors is an integer number (2849088).

Almost surely, 2^11388281 is an apocalyptic number.

It is an amenable number.

11388281 is a deficient number, since it is larger than the sum of its proper divisors (8071).

11388281 is an equidigital number, since it uses as much as digits as its factorization.

11388281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8070.

The product of its digits is 3072, while the sum is 32.

The square root of 11388281 is about 3374.6527228739. The cubic root of 11388281 is about 224.9845651964.

The spelling of 11388281 in words is "eleven million, three hundred eighty-eight thousand, two hundred eighty-one".