11231042509 has 2 divisors, whose sum is σ = 11231042510. Its totient is φ = 11231042508.

The previous prime is 11231042507. The next prime is 11231042597. The reversal of 11231042509 is 90524013211.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7568130025 + 3662912484 = 86995^2 + 60522^2 .

It is an emirp because it is prime and its reverse (90524013211) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 11231042509 - 2¹ = 11231042507 is a prime.

It is a super-2 number, since 2×11231042509² (a number of 21 digits) contains 22 as substring.

Together with 11231042507, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11231042507) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5615521254 + 5615521255.

It is an arithmetic number, because the mean of its divisors is an integer number (5615521255).

Almost surely, 2^11231042509 is an apocalyptic number.

It is an amenable number.

11231042509 is a deficient number, since it is larger than the sum of its proper divisors (1).

11231042509 is an equidigital number, since it uses as much as digits as its factorization.

11231042509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2160, while the sum is 28.

The spelling of 11231042509 in words is "eleven billion, two hundred thirty-one million, forty-two thousand, five hundred nine".