135478581 has 24 divisors (see below), whose sum is σ = 214611840. Its totient is φ = 75765312.

The previous prime is 135478561. The next prime is 135478657. The reversal of 135478581 is 185874531.

It is not a de Polignac number, because 135478581 - 2⁹ = 135478069 is a prime.

It is a super-2 number, since 2×135478581² = 36708891819547122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (135478561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2896 + ... + 16713.

It is an arithmetic number, because the mean of its divisors is an integer number (8942160).

Almost surely, 2^135478581 is an apocalyptic number.

It is an amenable number.

135478581 is a deficient number, since it is larger than the sum of its proper divisors (79133259).

135478581 is a wasteful number, since it uses less digits than its factorization.

135478581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19673 (or 19666 counting only the distinct ones).

The product of its digits is 134400, while the sum is 42.

The square root of 135478581 is about 11639.5266656338. The cubic root of 135478581 is about 513.5982631551.

The spelling of 135478581 in words is "one hundred thirty-five million, four hundred seventy-eight thousand, five hundred eighty-one".