135144521 has 4 divisors (see below), whose sum is σ = 135167952. Its totient is φ = 135121092.

The previous prime is 135144517. The next prime is 135144523. The reversal of 135144521 is 125441531.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 135144521 - 2² = 135144517 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (135144523) 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, 3686 + ... + 16848.

It is an arithmetic number, because the mean of its divisors is an integer number (33791988).

Almost surely, 2^135144521 is an apocalyptic number.

It is an amenable number.

135144521 is a deficient number, since it is larger than the sum of its proper divisors (23431).

135144521 is a wasteful number, since it uses less digits than its factorization.

135144521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23430.

The product of its digits is 2400, while the sum is 26.

The square root of 135144521 is about 11625.1675686848. The cubic root of 135144521 is about 513.1757760776.

The spelling of 135144521 in words is "one hundred thirty-five million, one hundred forty-four thousand, five hundred twenty-one".