11397281 has 4 divisors (see below), whose sum is σ = 13025472. Its totient is φ = 9769092.

The previous prime is 11397277. The next prime is 11397317. The reversal of 11397281 is 18279311.

11397281 is digitally balanced in base 2, 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.

It is a cyclic number.

It is not a de Polignac number, because 11397281 - 2² = 11397277 is a prime.

It is a super-2 number, since 2×11397281² = 259796028385922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11397241) 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, 814085 + ... + 814098.

It is an arithmetic number, because the mean of its divisors is an integer number (3256368).

Almost surely, 2^11397281 is an apocalyptic number.

It is an amenable number.

11397281 is a deficient number, since it is larger than the sum of its proper divisors (1628191).

11397281 is an equidigital number, since it uses as much as digits as its factorization.

11397281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1628190.

The product of its digits is 3024, while the sum is 32.

The square root of 11397281 is about 3375.9859300655. The cubic root of 11397281 is about 225.0438169808.

The spelling of 11397281 in words is "eleven million, three hundred ninety-seven thousand, two hundred eighty-one".