11613281 has 4 divisors (see below), whose sum is σ = 11702064. Its totient is φ = 11524500.

The previous prime is 11613271. The next prime is 11613289. The reversal of 11613281 is 18231611.

11613281 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 an emirpimes, since its reverse is a distinct semiprime: 18231611 = 101 ⋅180511.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11613281 is a prime.

It is a super-2 number, since 2×11613281² = 269736591169922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11613289) 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, 44195 + ... + 44456.

It is an arithmetic number, because the mean of its divisors is an integer number (2925516).

Almost surely, 2^11613281 is an apocalyptic number.

It is an amenable number.

11613281 is a deficient number, since it is larger than the sum of its proper divisors (88783).

11613281 is an equidigital number, since it uses as much as digits as its factorization.

11613281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88782.

The product of its digits is 288, while the sum is 23.

The square root of 11613281 is about 3407.8264333736. The cubic root of 11613281 is about 226.4565977130.

Adding to 11613281 its reverse (18231611), we get a palindrome (29844892).

The spelling of 11613281 in words is "eleven million, six hundred thirteen thousand, two hundred eighty-one".