11909281 has 2 divisors, whose sum is σ = 11909282. Its totient is φ = 11909280.

The previous prime is 11909279. The next prime is 11909291. The reversal of 11909281 is 18290911.

11909281 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11560000 + 349281 = 3400^2 + 591^2 .

It is a cyclic number.

It is not a de Polignac number, because 11909281 - 2¹ = 11909279 is a prime.

It is a super-2 number, since 2×11909281² = 283661947873922, which contains 22 as substring.

Together with 11909279, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (11909221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5954640 + 5954641.

It is an arithmetic number, because the mean of its divisors is an integer number (5954641).

Almost surely, 2^11909281 is an apocalyptic number.

It is an amenable number.

11909281 is a deficient number, since it is larger than the sum of its proper divisors (1).

11909281 is an equidigital number, since it uses as much as digits as its factorization.

11909281 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1296, while the sum is 31.

The square root of 11909281 is about 3450.9826136914. The cubic root of 11909281 is about 228.3644589083.

The spelling of 11909281 in words is "eleven million, nine hundred nine thousand, two hundred eighty-one".