11990281 has 2 divisors, whose sum is σ = 11990282. Its totient is φ = 11990280.

The previous prime is 11990261. The next prime is 11990339. The reversal of 11990281 is 18209911.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11964681 + 25600 = 3459^2 + 160^2 .

It is a cyclic number.

It is not a de Polignac number, because 11990281 - 2¹⁵ = 11957513 is a prime.

It is a super-2 number, since 2×11990281² = 287533676917922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (11990201) 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 as a sum of consecutive naturals, namely, 5995140 + 5995141.

It is an arithmetic number, because the mean of its divisors is an integer number (5995141).

Almost surely, 2^11990281 is an apocalyptic number.

It is an amenable number.

11990281 is a deficient number, since it is larger than the sum of its proper divisors (1).

11990281 is an equidigital number, since it uses as much as digits as its factorization.

11990281 is an odious number, because the sum of its binary digits is odd.

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

The square root of 11990281 is about 3462.6985141649. The cubic root of 11990281 is about 228.8810236071.

The spelling of 11990281 in words is "eleven million, nine hundred ninety thousand, two hundred eighty-one".