11511389 has 2 divisors, whose sum is σ = 11511390. Its totient is φ = 11511388.

The previous prime is 11511377. The next prime is 11511391. The reversal of 11511389 is 98311511.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11276164 + 235225 = 3358^2 + 485^2 .

It is a cyclic number.

It is not a de Polignac number, because 11511389 - 2⁸ = 11511133 is a prime.

Together with 11511391, 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 (11511319) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5755694 + 5755695.

It is an arithmetic number, because the mean of its divisors is an integer number (5755695).

Almost surely, 2^11511389 is an apocalyptic number.

It is an amenable number.

11511389 is a deficient number, since it is larger than the sum of its proper divisors (1).

11511389 is an equidigital number, since it uses as much as digits as its factorization.

11511389 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1080, while the sum is 29.

The square root of 11511389 is about 3392.8437924549. The cubic root of 11511389 is about 225.7923602571.

The spelling of 11511389 in words is "eleven million, five hundred eleven thousand, three hundred eighty-nine".