11456581 has 2 divisors, whose sum is σ = 11456582. Its totient is φ = 11456580.

The previous prime is 11456551. The next prime is 11456603. The reversal of 11456581 is 18565411.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9054081 + 2402500 = 3009^2 + 1550^2 .

It is a cyclic number.

It is not a de Polignac number, because 11456581 - 2¹⁹ = 10932293 is a prime.

It is a super-2 number, since 2×11456581² = 262506496419122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11456551) 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, 5728290 + 5728291.

It is an arithmetic number, because the mean of its divisors is an integer number (5728291).

Almost surely, 2^11456581 is an apocalyptic number.

It is an amenable number.

11456581 is a deficient number, since it is larger than the sum of its proper divisors (1).

11456581 is an equidigital number, since it uses as much as digits as its factorization.

11456581 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4800, while the sum is 31.

The square root of 11456581 is about 3384.7571552476. The cubic root of 11456581 is about 225.4334426640.

The spelling of 11456581 in words is "eleven million, four hundred fifty-six thousand, five hundred eighty-one".