11921311 has 2 divisors, whose sum is σ = 11921312. Its totient is φ = 11921310.

The previous prime is 11921297. The next prime is 11921317. The reversal of 11921311 is 11312911.

It is a strong prime.

It is an emirp because it is prime and its reverse (11312911) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 11921311 - 2⁷ = 11921183 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11921317) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5960655 + 5960656.

It is an arithmetic number, because the mean of its divisors is an integer number (5960656).

Almost surely, 2^11921311 is an apocalyptic number.

11921311 is a deficient number, since it is larger than the sum of its proper divisors (1).

11921311 is an equidigital number, since it uses as much as digits as its factorization.

11921311 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 54, while the sum is 19.

The square root of 11921311 is about 3452.7251555836. The cubic root of 11921311 is about 228.4413261274.

Subtracting from 11921311 its reverse (11312911), we obtain a square (608400 = 780²).

The spelling of 11921311 in words is "eleven million, nine hundred twenty-one thousand, three hundred eleven".