11406581 has 2 divisors, whose sum is σ = 11406582. Its totient is φ = 11406580.

The previous prime is 11406557. The next prime is 11406589. The reversal of 11406581 is 18560411.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10504081 + 902500 = 3241^2 + 950^2 .

It is a cyclic number.

It is not a de Polignac number, because 11406581 - 2¹⁰ = 11405557 is a prime.

It is a super-3 number, since 3×11406581³ (a number of 22 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 11406581.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11406589) 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, 5703290 + 5703291.

It is an arithmetic number, because the mean of its divisors is an integer number (5703291).

Almost surely, 2^11406581 is an apocalyptic number.

It is an amenable number.

11406581 is a deficient number, since it is larger than the sum of its proper divisors (1).

11406581 is an equidigital number, since it uses as much as digits as its factorization.

11406581 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 960, while the sum is 26.

The square root of 11406581 is about 3377.3630246096. The cubic root of 11406581 is about 225.1050110644.

Adding to 11406581 its reverse (18560411), we get a palindrome (29966992).

The spelling of 11406581 in words is "eleven million, four hundred six thousand, five hundred eighty-one".