135984109 has 2 divisors, whose sum is σ = 135984110. Its totient is φ = 135984108.

The previous prime is 135984091. The next prime is 135984127. The reversal of 135984109 is 901489531.

Together with previous prime (135984091) it forms an Ormiston pair, because they use the same digits, order apart.

It is a balanced prime because it is at equal distance from previous prime (135984091) and next prime (135984127).

It can be written as a sum of positive squares in only one way, i.e., 95062500 + 40921609 = 9750^2 + 6397^2 .

It is a cyclic number.

It is not a de Polignac number, because 135984109 - 2¹⁷ = 135853037 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (135924109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 67992054 + 67992055.

It is an arithmetic number, because the mean of its divisors is an integer number (67992055).

Almost surely, 2^135984109 is an apocalyptic number.

It is an amenable number.

135984109 is a deficient number, since it is larger than the sum of its proper divisors (1).

135984109 is an equidigital number, since it uses as much as digits as its factorization.

135984109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 38880, while the sum is 40.

The square root of 135984109 is about 11661.2224487830. Note that the first 3 decimals coincide. The cubic root of 135984109 is about 514.2362878241.

The spelling of 135984109 in words is "one hundred thirty-five million, nine hundred eighty-four thousand, one hundred nine".