135839481 has 4 divisors (see below), whose sum is σ = 181119312. Its totient is φ = 90559652.

The previous prime is 135839471. The next prime is 135839507. The reversal of 135839481 is 184938531.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 184938531 = 3 ⋅61646177.

It is a cyclic number.

It is not a de Polignac number, because 135839481 - 2¹⁰ = 135838457 is a prime.

It is a super-2 number, since 2×135839481² = 36904729196698722, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (135839441) 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, 22639911 + ... + 22639916.

It is an arithmetic number, because the mean of its divisors is an integer number (45279828).

Almost surely, 2^135839481 is an apocalyptic number.

It is an amenable number.

135839481 is a deficient number, since it is larger than the sum of its proper divisors (45279831).

135839481 is an equidigital number, since it uses as much as digits as its factorization.

135839481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45279830.

The product of its digits is 103680, while the sum is 42.

The square root of 135839481 is about 11655.0195624031. The cubic root of 135839481 is about 514.0539151709.

The spelling of 135839481 in words is "one hundred thirty-five million, eight hundred thirty-nine thousand, four hundred eighty-one".