135521479 has 4 divisors (see below), whose sum is σ = 135546984. Its totient is φ = 135495976.

The previous prime is 135521473. The next prime is 135521483. The reversal of 135521479 is 974125531.

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 135521479 - 2⁵ = 135521447 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 (135521473) 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 3 ways as a sum of consecutive naturals, for example, 1432 + ... + 16525.

It is an arithmetic number, because the mean of its divisors is an integer number (33886746).

Almost surely, 2^135521479 is an apocalyptic number.

135521479 is a deficient number, since it is larger than the sum of its proper divisors (25505).

135521479 is an equidigital number, since it uses as much as digits as its factorization.

135521479 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25504.

The product of its digits is 37800, while the sum is 37.

The square root of 135521479 is about 11641.3692923127. The cubic root of 135521479 is about 513.6524660978.

The spelling of 135521479 in words is "one hundred thirty-five million, five hundred twenty-one thousand, four hundred seventy-nine".