135989657 has 2 divisors, whose sum is σ = 135989658. Its totient is φ = 135989656.

The previous prime is 135989629. The next prime is 135989683. The reversal of 135989657 is 756989531.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 84566416 + 51423241 = 9196^2 + 7171^2 .

It is a cyclic number.

It is not a de Polignac number, because 135989657 - 2¹⁴ = 135973273 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 135989599 and 135989608.

It is not a weakly prime, because it can be changed into another prime (135989687) 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, 67994828 + 67994829.

It is an arithmetic number, because the mean of its divisors is an integer number (67994829).

Almost surely, 2^135989657 is an apocalyptic number.

It is an amenable number.

135989657 is a deficient number, since it is larger than the sum of its proper divisors (1).

135989657 is an equidigital number, since it uses as much as digits as its factorization.

135989657 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2041200, while the sum is 53.

The square root of 135989657 is about 11661.4603287924. The cubic root of 135989657 is about 514.2432811514.

The spelling of 135989657 in words is "one hundred thirty-five million, nine hundred eighty-nine thousand, six hundred fifty-seven".