11771281 has 4 divisors (see below), whose sum is σ = 11805552. Its totient is φ = 11737012.

The previous prime is 11771269. The next prime is 11771299. The reversal of 11771281 is 18217711.

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: 18217711 = 61 ⋅298651.

It is a cyclic number.

It is not a de Polignac number, because 11771281 - 2⁷ = 11771153 is a prime.

It is a super-2 number, since 2×11771281² = 277126112761922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11771261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16615 + ... + 17308.

It is an arithmetic number, because the mean of its divisors is an integer number (2951388).

Almost surely, 2^11771281 is an apocalyptic number.

It is an amenable number.

11771281 is a deficient number, since it is larger than the sum of its proper divisors (34271).

11771281 is an equidigital number, since it uses as much as digits as its factorization.

11771281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34270.

The product of its digits is 784, while the sum is 28.

The square root of 11771281 is about 3430.9300488352. The cubic root of 11771281 is about 227.4789643634.

Adding to 11771281 its reverse (18217711), we get a palindrome (29988992).

The spelling of 11771281 in words is "eleven million, seven hundred seventy-one thousand, two hundred eighty-one".