135421423549 has 4 divisors (see below), whose sum is σ = 135423503836. Its totient is φ = 135419343264.

The previous prime is 135421423537. The next prime is 135421423573. The reversal of 135421423549 is 945324124531.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 29021507449 + 106399916100 = 170357^2 + 326190^2 .

It is a cyclic number.

It is not a de Polignac number, because 135421423549 - 2¹³ = 135421415357 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (135421423849) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 939234 + ... + 1073779.

It is an arithmetic number, because the mean of its divisors is an integer number (33855875959).

Almost surely, 2^135421423549 is an apocalyptic number.

It is an amenable number.

135421423549 is a deficient number, since it is larger than the sum of its proper divisors (2080287).

135421423549 is an equidigital number, since it uses as much as digits as its factorization.

135421423549 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2080286.

The product of its digits is 518400, while the sum is 43.

The spelling of 135421423549 in words is "one hundred thirty-five billion, four hundred twenty-one million, four hundred twenty-three thousand, five hundred forty-nine".