11281533 has 4 divisors (see below), whose sum is σ = 15042048. Its totient is φ = 7521020.

The previous prime is 11281531. The next prime is 11281541. The reversal of 11281533 is 33518211.

11281533 is digitally balanced in base 2 and base 4, because in such bases 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.

It is a cyclic number.

It is not a de Polignac number, because 11281533 - 2¹ = 11281531 is a prime.

It is a super-3 number, since 3×11281533³ (a number of 22 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11281531) 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, 1880253 + ... + 1880258.

It is an arithmetic number, because the mean of its divisors is an integer number (3760512).

Almost surely, 2^11281533 is an apocalyptic number.

It is an amenable number.

11281533 is a deficient number, since it is larger than the sum of its proper divisors (3760515).

11281533 is an equidigital number, since it uses as much as digits as its factorization.

11281533 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3760514.

The product of its digits is 720, while the sum is 24.

The square root of 11281533 is about 3358.7993390496. The cubic root of 11281533 is about 224.2793933450.

Adding to 11281533 its reverse (33518211), we get a palindrome (44799744).

The spelling of 11281533 in words is "eleven million, two hundred eighty-one thousand, five hundred thirty-three".