135581506 has 8 divisors (see below), whose sum is σ = 208332684. Its totient is φ = 66137280.

The previous prime is 135581461. The next prime is 135581533. The reversal of 135581506 is 605185531.

It can be written as a sum of positive squares in 2 ways, for example, as 98188281 + 37393225 = 9909^2 + 6115^2 .

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 826635 + ... + 826798.

Almost surely, 2^135581506 is an apocalyptic number.

135581506 is a deficient number, since it is larger than the sum of its proper divisors (72751178).

135581506 is a wasteful number, since it uses less digits than its factorization.

135581506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1653476.

The product of its (nonzero) digits is 18000, while the sum is 34.

The square root of 135581506 is about 11643.9471829788. The cubic root of 135581506 is about 513.7282928612.

The spelling of 135581506 in words is "one hundred thirty-five million, five hundred eighty-one thousand, five hundred six".