11158661 has 2 divisors, whose sum is σ = 11158662. Its totient is φ = 11158660.

The previous prime is 11158633. The next prime is 11158663. The reversal of 11158661 is 16685111.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10660225 + 498436 = 3265^2 + 706^2 .

It is an emirp because it is prime and its reverse (16685111) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11158661 is a prime.

Together with 11158663, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11158663) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5579330 + 5579331.

It is an arithmetic number, because the mean of its divisors is an integer number (5579331).

Almost surely, 2^11158661 is an apocalyptic number.

It is an amenable number.

11158661 is a deficient number, since it is larger than the sum of its proper divisors (1).

11158661 is an equidigital number, since it uses as much as digits as its factorization.

11158661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1440, while the sum is 29.

The square root of 11158661 is about 3340.4582021034. The cubic root of 11158661 is about 223.4621783197.

The spelling of 11158661 in words is "eleven million, one hundred fifty-eight thousand, six hundred sixty-one".