11156489 has 2 divisors, whose sum is σ = 11156490. Its totient is φ = 11156488.

The previous prime is 11156461. The next prime is 11156491. The reversal of 11156489 is 98465111.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10837264 + 319225 = 3292^2 + 565^2 .

It is an emirp because it is prime and its reverse (98465111) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11156489 is a prime.

Together with 11156491, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (11156429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5578244 + 5578245.

It is an arithmetic number, because the mean of its divisors is an integer number (5578245).

Almost surely, 2^11156489 is an apocalyptic number.

It is an amenable number.

11156489 is a deficient number, since it is larger than the sum of its proper divisors (1).

11156489 is an equidigital number, since it uses as much as digits as its factorization.

11156489 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8640, while the sum is 35.

The square root of 11156489 is about 3340.1330811810. The cubic root of 11156489 is about 223.4476786306.

The spelling of 11156489 in words is "eleven million, one hundred fifty-six thousand, four hundred eighty-nine".