11989511 has 2 divisors, whose sum is σ = 11989512. Its totient is φ = 11989510.

The previous prime is 11989493. The next prime is 11989519. The reversal of 11989511 is 11598911.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 11989511 - 2¹⁸ = 11727367 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11989519) 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, 5994755 + 5994756.

It is an arithmetic number, because the mean of its divisors is an integer number (5994756).

Almost surely, 2^11989511 is an apocalyptic number.

11989511 is a deficient number, since it is larger than the sum of its proper divisors (1).

11989511 is an equidigital number, since it uses as much as digits as its factorization.

11989511 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3240, while the sum is 35.

The square root of 11989511 is about 3462.5873274186. The cubic root of 11989511 is about 228.8761240232.

The spelling of 11989511 in words is "eleven million, nine hundred eighty-nine thousand, five hundred eleven".