136612181 has 4 divisors (see below), whose sum is σ = 138020652. Its totient is φ = 135203712.

The previous prime is 136612163. The next prime is 136612193. The reversal of 136612181 is 181216631.

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 30625156 + 105987025 = 5534^2 + 10295^2 .

It is a cyclic number.

It is not a de Polignac number, because 136612181 - 2⁶ = 136612117 is a prime.

It is a super-2 number, since 2×136612181² = 37325775995153522, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (136612121) 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, 704090 + ... + 704283.

It is an arithmetic number, because the mean of its divisors is an integer number (34505163).

Almost surely, 2^136612181 is an apocalyptic number.

It is an amenable number.

136612181 is a deficient number, since it is larger than the sum of its proper divisors (1408471).

136612181 is an equidigital number, since it uses as much as digits as its factorization.

136612181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1408470.

The product of its digits is 1728, while the sum is 29.

The square root of 136612181 is about 11688.1213631618. The cubic root of 136612181 is about 515.0267758724.

The spelling of 136612181 in words is "one hundred thirty-six million, six hundred twelve thousand, one hundred eighty-one".