135990161 has 2 divisors, whose sum is σ = 135990162. Its totient is φ = 135990160.

The previous prime is 135990139. The next prime is 135990181. The reversal of 135990161 is 161099531.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 127690000 + 8300161 = 11300^2 + 2881^2 .

It is a cyclic number.

It is not a de Polignac number, because 135990161 - 2⁶ = 135990097 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (135990181) 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, 67995080 + 67995081.

It is an arithmetic number, because the mean of its divisors is an integer number (67995081).

Almost surely, 2^135990161 is an apocalyptic number.

It is an amenable number.

135990161 is a deficient number, since it is larger than the sum of its proper divisors (1).

135990161 is an equidigital number, since it uses as much as digits as its factorization.

135990161 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7290, while the sum is 35.

The square root of 135990161 is about 11661.4819384159. The cubic root of 135990161 is about 514.2439164406.

The spelling of 135990161 in words is "one hundred thirty-five million, nine hundred ninety thousand, one hundred sixty-one".