135461521 has 8 divisors (see below), whose sum is σ = 146490344. Its totient is φ = 124519680.

The previous prime is 135461509. The next prime is 135461527. The reversal of 135461521 is 125164531.

It can be written as a sum of positive squares in 4 ways, for example, as 65025 + 135396496 = 255^2 + 11636^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 135461521 - 2⁹ = 135461009 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 135461521.

It is not an unprimeable number, because it can be changed into a prime (135461527) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18486 + ... + 24751.

It is an arithmetic number, because the mean of its divisors is an integer number (18311293).

Almost surely, 2^135461521 is an apocalyptic number.

It is an amenable number.

135461521 is a deficient number, since it is larger than the sum of its proper divisors (11028823).

135461521 is a wasteful number, since it uses less digits than its factorization.

135461521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43491.

The product of its digits is 3600, while the sum is 28.

The square root of 135461521 is about 11638.7937948913. The cubic root of 135461521 is about 513.5767041404.

The spelling of 135461521 in words is "one hundred thirty-five million, four hundred sixty-one thousand, five hundred twenty-one".