136844861 has 8 divisors (see below), whose sum is σ = 138059064. Its totient is φ = 135636480.

The previous prime is 136844843. The next prime is 136844879. The reversal of 136844861 is 168448631.

It is an interprime number because it is at equal distance from previous prime (136844843) and next prime (136844879).

It can be written as a sum of positive squares in 4 ways, for example, as 48372025 + 88472836 = 6955^2 + 9406^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 136844861 - 2¹⁴ = 136828477 is a prime.

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 (136844891) 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 7 ways as a sum of consecutive naturals, for example, 54935 + ... + 57371.

It is an arithmetic number, because the mean of its divisors is an integer number (17257383).

Almost surely, 2^136844861 is an apocalyptic number.

It is an amenable number.

136844861 is a deficient number, since it is larger than the sum of its proper divisors (1214203).

136844861 is a wasteful number, since it uses less digits than its factorization.

136844861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2911.

The product of its digits is 110592, while the sum is 41.

The square root of 136844861 is about 11698.0708238581. The cubic root of 136844861 is about 515.3190105714.

The spelling of 136844861 in words is "one hundred thirty-six million, eight hundred forty-four thousand, eight hundred sixty-one".