135422521 has 4 divisors (see below), whose sum is σ = 145839652. Its totient is φ = 125005392.

The previous prime is 135422509. The next prime is 135422531. The reversal of 135422521 is 125224531.

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 27678121 + 107744400 = 5261^2 + 10380^2 .

It is a cyclic number.

It is not a de Polignac number, because 135422521 - 2⁷ = 135422393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (135422531) 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, 5208546 + ... + 5208571.

It is an arithmetic number, because the mean of its divisors is an integer number (36459913).

Almost surely, 2^135422521 is an apocalyptic number.

It is an amenable number.

135422521 is a deficient number, since it is larger than the sum of its proper divisors (10417131).

135422521 is a wasteful number, since it uses less digits than its factorization.

135422521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10417130.

The product of its digits is 2400, while the sum is 25.

The square root of 135422521 is about 11637.1182429328. The cubic root of 135422521 is about 513.5274123715.

The spelling of 135422521 in words is "one hundred thirty-five million, four hundred twenty-two thousand, five hundred twenty-one".