136891 has 4 divisors (see below), whose sum is σ = 137632. Its totient is φ = 136152.

The previous prime is 136889. The next prime is 136897. The reversal of 136891 is 198631.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 198631 = 139 ⋅1429.

It is a cyclic number.

It is not a de Polignac number, because 136891 - 2¹ = 136889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (136897) 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, 181 + ... + 553.

It is an arithmetic number, because the mean of its divisors is an integer number (34408).

2¹³⁶⁸⁹¹ is an apocalyptic number.

136891 is a deficient number, since it is larger than the sum of its proper divisors (741).

136891 is an equidigital number, since it uses as much as digits as its factorization.

136891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 740.

The product of its digits is 1296, while the sum is 28.

The square root of 136891 is about 369.9878376379. The cubic root of 136891 is about 51.5376919535.

The spelling of 136891 in words is "one hundred thirty-six thousand, eight hundred ninety-one".