• 136 can be written using four 4's:
136 has 8 divisors (see below), whose sum is σ = 270. Its totient is φ = 64.
The previous prime is 131. The next prime is 137. The reversal of 136 is 631.
136 is nontrivially palindromic in base 9 and base 16.
136 is an esthetic number in base 8 and base 14, because in such bases its adjacent digits differ by 1.
136 is a nontrivial binomial coefficient, being equal to C(17, 2).
It can be written as a sum of positive squares in only one way, i.e., 100 + 36 = 10^2 + 6^2 .
It is a tau number, because it is divible by the number of its divisors (8).
It is a hoax number, since the sum of its digits (10) coincides with the sum of the digits of its distinct prime factors.
It is a magnanimous number.
136 is an undulating number in base 4 and base 9.
136 is a nontrivial repdigit in base 16.
It is a plaindrome in base 6, base 10, base 11, base 14 and base 16.
It is a nialpdrome in base 8, base 12, base 13, base 15 and base 16.
It is a zygodrome in base 16.
It is a congruent number.
It is a pernicious number, because its binary representation contains a prime number (2) of ones.
In principle, a polygon with 136 sides can be constructed with ruler and compass.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1 + ... + 16.
136 is the 16-th triangular number.
136 is the 10-th centered triangular number and also the 6-th centered nonagonal number.
It is an amenable number.
136 is a deficient number, since it is larger than the sum of its proper divisors (134).
136 is a wasteful number, since it uses less digits than its factorization.
136 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 23 (or 19 counting only the distinct ones).
The product of its digits is 18, while the sum is 10.
The square root of 136 is about 11.6619037897. The cubic root of 136 is about 5.1425631813.
Adding to 136 its reverse (631), we get a palindrome (767).
It can be divided in two parts, 13 and 6, that multiplied together give a triangular number (78 = T12).
The spelling of 136 in words is "one hundred thirty-six", and thus it is an aban number.
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