136644533 has 4 divisors (see below), whose sum is σ = 136693068. Its totient is φ = 136596000.

The previous prime is 136644509. The next prime is 136644553. The reversal of 136644533 is 335446631.

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 70677649 + 65966884 = 8407^2 + 8122^2 .

It is a cyclic number.

It is not a de Polignac number, because 136644533 - 2¹² = 136640437 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 136644493 and 136644502.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (136644503) 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, 19766 + ... + 25767.

It is an arithmetic number, because the mean of its divisors is an integer number (34173267).

Almost surely, 2^136644533 is an apocalyptic number.

It is an amenable number.

136644533 is a deficient number, since it is larger than the sum of its proper divisors (48535).

136644533 is an equidigital number, since it uses as much as digits as its factorization.

136644533 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48534.

The product of its digits is 77760, while the sum is 35.

The square root of 136644533 is about 11689.5052504372. The cubic root of 136644533 is about 515.0674282530.

The spelling of 136644533 in words is "one hundred thirty-six million, six hundred forty-four thousand, five hundred thirty-three".