11613821509 has 2 divisors, whose sum is σ = 11613821510. Its totient is φ = 11613821508.

The previous prime is 11613821501. The next prime is 11613821561. The reversal of 11613821509 is 90512831611.

11613821509 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., 8515229284 + 3098592225 = 92278^2 + 55665^2 .

It is a cyclic number.

It is not a de Polignac number, because 11613821509 - 2³ = 11613821501 is a prime.

It is a super-2 number, since 2×11613821509² (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 (11613821501) 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, 5806910754 + 5806910755.

It is an arithmetic number, because the mean of its divisors is an integer number (5806910755).

Almost surely, 2^11613821509 is an apocalyptic number.

It is an amenable number.

11613821509 is a deficient number, since it is larger than the sum of its proper divisors (1).

11613821509 is an equidigital number, since it uses as much as digits as its factorization.

11613821509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12960, while the sum is 37.

The spelling of 11613821509 in words is "eleven billion, six hundred thirteen million, eight hundred twenty-one thousand, five hundred nine".