11582981 has 2 divisors, whose sum is σ = 11582982. Its totient is φ = 11582980.

The previous prime is 11582971. The next prime is 11582993. The reversal of 11582981 is 18928511.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11498881 + 84100 = 3391^2 + 290^2 .

It is a cyclic number.

It is not a de Polignac number, because 11582981 - 2⁶ = 11582917 is a prime.

It is a super-2 number, since 2×11582981² = 268330897692722, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11582971) 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, 5791490 + 5791491.

It is an arithmetic number, because the mean of its divisors is an integer number (5791491).

Almost surely, 2^11582981 is an apocalyptic number.

It is an amenable number.

11582981 is a deficient number, since it is larger than the sum of its proper divisors (1).

11582981 is an equidigital number, since it uses as much as digits as its factorization.

11582981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5760, while the sum is 35.

The square root of 11582981 is about 3403.3778808707. The cubic root of 11582981 is about 226.2594782513.

The spelling of 11582981 in words is "eleven million, five hundred eighty-two thousand, nine hundred eighty-one".