11981329 has 2 divisors, whose sum is σ = 11981330. Its totient is φ = 11981328.

The previous prime is 11981317. The next prime is 11981341. The reversal of 11981329 is 92318911.

It is a balanced prime because it is at equal distance from previous prime (11981317) and next prime (11981341).

It can be written as a sum of positive squares in only one way, i.e., 11916304 + 65025 = 3452^2 + 255^2 .

It is a cyclic number.

It is not a de Polignac number, because 11981329 - 2⁵ = 11981297 is a prime.

It is equal to p₇₈₆₉₁₃ and since 11981329 and 786913 have the same sum of digits, it is a Honaker prime.

It is a junction number, because it is equal to n+sod(n) for n = 11981294 and 11981303.

It is not a weakly prime, because it can be changed into another prime (11981399) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5990664 + 5990665.

It is an arithmetic number, because the mean of its divisors is an integer number (5990665).

Almost surely, 2^11981329 is an apocalyptic number.

It is an amenable number.

11981329 is a deficient number, since it is larger than the sum of its proper divisors (1).

11981329 is an equidigital number, since it uses as much as digits as its factorization.

11981329 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3888, while the sum is 34.

The square root of 11981329 is about 3461.4056393321. The cubic root of 11981329 is about 228.8240482103.

The spelling of 11981329 in words is "eleven million, nine hundred eighty-one thousand, three hundred twenty-nine".