11659381 has 2 divisors, whose sum is σ = 11659382. Its totient is φ = 11659380.

The previous prime is 11659343. The next prime is 11659387. The reversal of 11659381 is 18395611.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11492100 + 167281 = 3390^2 + 409^2 .

It is a cyclic number.

It is not a de Polignac number, because 11659381 - 2⁷ = 11659253 is a prime.

It is a super-2 number, since 2×11659381² = 271882330606322, which contains 22 as substring.

It is equal to p₇₆₇₁₄₉ and since 11659381 and 767149 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11659387) 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, 5829690 + 5829691.

It is an arithmetic number, because the mean of its divisors is an integer number (5829691).

Almost surely, 2^11659381 is an apocalyptic number.

It is an amenable number.

11659381 is a deficient number, since it is larger than the sum of its proper divisors (1).

11659381 is an equidigital number, since it uses as much as digits as its factorization.

11659381 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6480, while the sum is 34.

The square root of 11659381 is about 3414.5835763677. The cubic root of 11659381 is about 226.7558489415.

The spelling of 11659381 in words is "eleven million, six hundred fifty-nine thousand, three hundred eighty-one".