136731845 has 4 divisors (see below), whose sum is σ = 164078220. Its totient is φ = 109385472.

The previous prime is 136731841. The next prime is 136731911. The reversal of 136731845 is 548137631.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 548137631 = 19 ⋅28849349.

It can be written as a sum of positive squares in 2 ways, for example, as 102556129 + 34175716 = 10127^2 + 5846^2 .

It is a cyclic number.

It is not a de Polignac number, because 136731845 - 2² = 136731841 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 136731799 and 136731808.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (136731841) 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, 13673180 + ... + 13673189.

It is an arithmetic number, because the mean of its divisors is an integer number (41019555).

Almost surely, 2^136731845 is an apocalyptic number.

It is an amenable number.

136731845 is a deficient number, since it is larger than the sum of its proper divisors (27346375).

136731845 is an equidigital number, since it uses as much as digits as its factorization.

136731845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27346374.

The product of its digits is 60480, while the sum is 38.

The square root of 136731845 is about 11693.2392860148. The cubic root of 136731845 is about 515.1771094119.

The spelling of 136731845 in words is "one hundred thirty-six million, seven hundred thirty-one thousand, eight hundred forty-five".