135521151 has 4 divisors (see below), whose sum is σ = 180694872. Its totient is φ = 90347432.

The previous prime is 135521149. The next prime is 135521201. The reversal of 135521151 is 151125531.

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

It is a cyclic number.

It is not a de Polignac number, because 135521151 - 2¹ = 135521149 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (135521051) 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, 22586856 + ... + 22586861.

It is an arithmetic number, because the mean of its divisors is an integer number (45173718).

Almost surely, 2^135521151 is an apocalyptic number.

135521151 is a deficient number, since it is larger than the sum of its proper divisors (45173721).

135521151 is an equidigital number, since it uses as much as digits as its factorization.

135521151 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45173720.

The product of its digits is 750, while the sum is 24.

The square root of 135521151 is about 11641.3552046143. The cubic root of 135521151 is about 513.6520517031.

Adding to 135521151 its reverse (151125531), we get a palindrome (286646682).

The spelling of 135521151 in words is "one hundred thirty-five million, five hundred twenty-one thousand, one hundred fifty-one".