136405481 has 4 divisors (see below), whose sum is σ = 136517700. Its totient is φ = 136293264.

The previous prime is 136405471. The next prime is 136405499. The reversal of 136405481 is 184504631.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 135373225 + 1032256 = 11635^2 + 1016^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-136405481 is a prime.

It is a super-2 number, since 2×136405481² = 37212910493682722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (136405471) by changing a digit.

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, 54266 + ... + 56723.

It is an arithmetic number, because the mean of its divisors is an integer number (34129425).

Almost surely, 2^136405481 is an apocalyptic number.

It is an amenable number.

136405481 is a deficient number, since it is larger than the sum of its proper divisors (112219).

136405481 is a wasteful number, since it uses less digits than its factorization.

136405481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 112218.

The product of its (nonzero) digits is 11520, while the sum is 32.

The square root of 136405481 is about 11679.2757052824. The cubic root of 136405481 is about 514.7668923350.

The spelling of 136405481 in words is "one hundred thirty-six million, four hundred five thousand, four hundred eighty-one".