11279518381 has 2 divisors, whose sum is σ = 11279518382. Its totient is φ = 11279518380.

The previous prime is 11279518373. The next prime is 11279518417. The reversal of 11279518381 is 18381597211.

11279518381 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8443955881 + 2835562500 = 91891^2 + 53250^2 .

It is a cyclic number.

It is not a de Polignac number, because 11279518381 - 2³ = 11279518373 is a prime.

It is a super-2 number, since 2×11279518381² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11279518331) 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, 5639759190 + 5639759191.

It is an arithmetic number, because the mean of its divisors is an integer number (5639759191).

Almost surely, 2^11279518381 is an apocalyptic number.

It is an amenable number.

11279518381 is a deficient number, since it is larger than the sum of its proper divisors (1).

11279518381 is an equidigital number, since it uses as much as digits as its factorization.

11279518381 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 120960, while the sum is 46.

The spelling of 11279518381 in words is "eleven billion, two hundred seventy-nine million, five hundred eighteen thousand, three hundred eighty-one".