136512121 has 2 divisors, whose sum is σ = 136512122. Its totient is φ = 136512120.

The previous prime is 136512119. The next prime is 136512149. The reversal of 136512121 is 121215631.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 122412096 + 14100025 = 11064^2 + 3755^2 .

It is an emirp because it is prime and its reverse (121215631) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 136512121 - 2¹ = 136512119 is a prime.

Together with 136512119, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 136512092 and 136512101.

It is not a weakly prime, because it can be changed into another prime (136512151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 68256060 + 68256061.

It is an arithmetic number, because the mean of its divisors is an integer number (68256061).

Almost surely, 2^136512121 is an apocalyptic number.

It is an amenable number.

136512121 is a deficient number, since it is larger than the sum of its proper divisors (1).

136512121 is an equidigital number, since it uses as much as digits as its factorization.

136512121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 360, while the sum is 22.

The square root of 136512121 is about 11683.8401649458. The cubic root of 136512121 is about 514.9010033738.

Adding to 136512121 its reverse (121215631), we get a palindrome (257727752).

The spelling of 136512121 in words is "one hundred thirty-six million, five hundred twelve thousand, one hundred twenty-one".