11891389 has 2 divisors, whose sum is σ = 11891390. Its totient is φ = 11891388.

The previous prime is 11891387. The next prime is 11891413. The reversal of 11891389 is 98319811.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9765625 + 2125764 = 3125^2 + 1458^2 .

It is a cyclic number.

It is not a de Polignac number, because 11891389 - 2¹ = 11891387 is a prime.

Together with 11891387, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11891387) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5945694 + 5945695.

It is an arithmetic number, because the mean of its divisors is an integer number (5945695).

Almost surely, 2^11891389 is an apocalyptic number.

It is an amenable number.

11891389 is a deficient number, since it is larger than the sum of its proper divisors (1).

11891389 is an equidigital number, since it uses as much as digits as its factorization.

11891389 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15552, while the sum is 40.

The square root of 11891389 is about 3448.3893341675. The cubic root of 11891389 is about 228.2500398887.

The spelling of 11891389 in words is "eleven million, eight hundred ninety-one thousand, three hundred eighty-nine".