135520447 has 8 divisors (see below), whose sum is σ = 144176112. Its totient is φ = 126940800.

The previous prime is 135520433. The next prime is 135520453. The reversal of 135520447 is 744025531.

135520447 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 135520447 - 2¹¹ = 135518399 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (135521447) 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, 15304 + ... + 22477.

It is an arithmetic number, because the mean of its divisors is an integer number (18022014).

Almost surely, 2^135520447 is an apocalyptic number.

135520447 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

135520447 is a deficient number, since it is larger than the sum of its proper divisors (8655665).

135520447 is a wasteful number, since it uses less digits than its factorization.

135520447 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38009.

The product of its (nonzero) digits is 16800, while the sum is 31.

The square root of 135520447 is about 11641.3249675456. The cubic root of 135520447 is about 513.6511622683.

Adding to 135520447 its reverse (744025531), we get a palindrome (879545978).

The spelling of 135520447 in words is "one hundred thirty-five million, five hundred twenty thousand, four hundred forty-seven".