135423820431919 has 2 divisors, whose sum is σ = 135423820431920. Its totient is φ = 135423820431918.

The previous prime is 135423820431917. The next prime is 135423820431947. The reversal of 135423820431919 is 919134028324531.

It is a weak prime.

It is an emirp because it is prime and its reverse (919134028324531) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 135423820431919 - 2¹ = 135423820431917 is a prime.

It is a super-2 number, since 2×135423820431919² (a number of 29 digits) contains 22 as substring.

Together with 135423820431917, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 135423820431919.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (135423820431917) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 67711910215959 + 67711910215960.

It is an arithmetic number, because the mean of its divisors is an integer number (67711910215960).

Almost surely, 2^{135423820431919} is an apocalyptic number.

135423820431919 is a deficient number, since it is larger than the sum of its proper divisors (1).

135423820431919 is an equidigital number, since it uses as much as digits as its factorization.

135423820431919 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5598720, while the sum is 55.

The spelling of 135423820431919 in words is "one hundred thirty-five trillion, four hundred twenty-three billion, eight hundred twenty million, four hundred thirty-one thousand, nine hundred nineteen".