135605123 has 2 divisors, whose sum is σ = 135605124. Its totient is φ = 135605122.

The previous prime is 135605027. The next prime is 135605137. The reversal of 135605123 is 321506531.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 135605123 - 2⁸ = 135604867 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 135605092 and 135605101.

It is not a weakly prime, because it can be changed into another prime (135605143) 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, 67802561 + 67802562.

It is an arithmetic number, because the mean of its divisors is an integer number (67802562).

Almost surely, 2^135605123 is an apocalyptic number.

135605123 is a deficient number, since it is larger than the sum of its proper divisors (1).

135605123 is an equidigital number, since it uses as much as digits as its factorization.

135605123 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2700, while the sum is 26.

The square root of 135605123 is about 11644.9612708673. The cubic root of 135605123 is about 513.7581199791.

The spelling of 135605123 in words is "one hundred thirty-five million, six hundred five thousand, one hundred twenty-three".