135411521 has 8 divisors (see below), whose sum is σ = 157293504. Its totient is φ = 114163920.

The previous prime is 135411517. The next prime is 135411553. The reversal of 135411521 is 125114531.

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 135411521 - 2² = 135411517 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (135411581) 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, 158135 + ... + 158988.

It is an arithmetic number, because the mean of its divisors is an integer number (19661688).

Almost surely, 2^135411521 is an apocalyptic number.

It is an amenable number.

135411521 is a deficient number, since it is larger than the sum of its proper divisors (21881983).

135411521 is an equidigital number, since it uses as much as digits as its factorization.

135411521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 317191.

The product of its digits is 600, while the sum is 23.

The square root of 135411521 is about 11636.6456077342. The cubic root of 135411521 is about 513.5135078539.

The spelling of 135411521 in words is "one hundred thirty-five million, four hundred eleven thousand, five hundred twenty-one".