11813281 has 2 divisors, whose sum is σ = 11813282. Its totient is φ = 11813280.

The previous prime is 11813251. The next prime is 11813287. The reversal of 11813281 is 18231811.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9120400 + 2692881 = 3020^2 + 1641^2 .

It is a cyclic number.

It is not a de Polignac number, because 11813281 - 2⁹ = 11812769 is a prime.

It is a super-2 number, since 2×11813281² = 279107215969922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (11813287) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5906640 + 5906641.

It is an arithmetic number, because the mean of its divisors is an integer number (5906641).

Almost surely, 2^11813281 is an apocalyptic number.

It is an amenable number.

11813281 is a deficient number, since it is larger than the sum of its proper divisors (1).

11813281 is an equidigital number, since it uses as much as digits as its factorization.

11813281 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 384, while the sum is 25.

The square root of 11813281 is about 3437.0453881204. The cubic root of 11813281 is about 227.7491919885.

The spelling of 11813281 in words is "eleven million, eight hundred thirteen thousand, two hundred eighty-one".