11657281 has 2 divisors, whose sum is σ = 11657282. Its totient is φ = 11657280.

The previous prime is 11657273. The next prime is 11657287. The reversal of 11657281 is 18275611.

11657281 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9511056 + 2146225 = 3084^2 + 1465^2 .

It is a cyclic number.

It is not a de Polignac number, because 11657281 - 2³ = 11657273 is a prime.

It is a super-2 number, since 2×11657281² = 271784400625922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (11657287) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5828640 + 5828641.

It is an arithmetic number, because the mean of its divisors is an integer number (5828641).

Almost surely, 2^11657281 is an apocalyptic number.

It is an amenable number.

11657281 is a deficient number, since it is larger than the sum of its proper divisors (1).

11657281 is an equidigital number, since it uses as much as digits as its factorization.

11657281 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3360, while the sum is 31.

The square root of 11657281 is about 3414.2760579660. The cubic root of 11657281 is about 226.7422342715.

The spelling of 11657281 in words is "eleven million, six hundred fifty-seven thousand, two hundred eighty-one".