11387281 has 2 divisors, whose sum is σ = 11387282. Its totient is φ = 11387280.

The previous prime is 11387273. The next prime is 11387287. The reversal of 11387281 is 18278311.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8179600 + 3207681 = 2860^2 + 1791^2 .

It is a cyclic number.

It is not a de Polignac number, because 11387281 - 2³ = 11387273 is a prime.

It is a super-2 number, since 2×11387281² = 259340337145922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (11387287) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5693640 + 5693641.

It is an arithmetic number, because the mean of its divisors is an integer number (5693641).

Almost surely, 2^11387281 is an apocalyptic number.

It is an amenable number.

11387281 is a deficient number, since it is larger than the sum of its proper divisors (1).

11387281 is an equidigital number, since it uses as much as digits as its factorization.

11387281 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2688, while the sum is 31.

The square root of 11387281 is about 3374.5045562275. The cubic root of 11387281 is about 224.9779797380.

The spelling of 11387281 in words is "eleven million, three hundred eighty-seven thousand, two hundred eighty-one".