136645 has 4 divisors (see below), whose sum is σ = 163980. Its totient is φ = 109312.

The previous prime is 136621. The next prime is 136649. The reversal of 136645 is 546631.

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 57121 + 79524 = 239^2 + 282^2 .

It is a cyclic number.

It is not a de Polignac number, because 136645 - 2⁹ = 136133 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (136649) 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, 13660 + ... + 13669.

It is an arithmetic number, because the mean of its divisors is an integer number (40995).

2¹³⁶⁶⁴⁵ is an apocalyptic number.

It is an amenable number.

136645 is a deficient number, since it is larger than the sum of its proper divisors (27335).

136645 is an equidigital number, since it uses as much as digits as its factorization.

136645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27334.

The product of its digits is 2160, while the sum is 25.

The square root of 136645 is about 369.6552447890. The cubic root of 136645 is about 51.5068015022.

The spelling of 136645 in words is "one hundred thirty-six thousand, six hundred forty-five".