136418981 has 2 divisors, whose sum is σ = 136418982. Its totient is φ = 136418980.

The previous prime is 136418959. The next prime is 136419007. The reversal of 136418981 is 189814631.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 130896481 + 5522500 = 11441^2 + 2350^2 .

It is an emirp because it is prime and its reverse (189814631) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 136418981 - 2¹⁴ = 136402597 is a prime.

It is a super-2 number, since 2×136418981² = 37220276754156722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (136418951) 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 as a sum of consecutive naturals, namely, 68209490 + 68209491.

It is an arithmetic number, because the mean of its divisors is an integer number (68209491).

Almost surely, 2^136418981 is an apocalyptic number.

It is an amenable number.

136418981 is a deficient number, since it is larger than the sum of its proper divisors (1).

136418981 is an equidigital number, since it uses as much as digits as its factorization.

136418981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 41472, while the sum is 41.

The square root of 136418981 is about 11679.8536377816. The cubic root of 136418981 is about 514.7838738711.

It can be divided in two parts, 13641 and 8981, that added together give a palindrome (22622).

The spelling of 136418981 in words is "one hundred thirty-six million, four hundred eighteen thousand, nine hundred eighty-one".