135717121 has 2 divisors, whose sum is σ = 135717122. Its totient is φ = 135717120.

The previous prime is 135717107. The next prime is 135717161. The reversal of 135717121 is 121717531.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 91680625 + 44036496 = 9575^2 + 6636^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-135717121 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 135717121.

It is not a weakly prime, because it can be changed into another prime (135717161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 67858560 + 67858561.

It is an arithmetic number, because the mean of its divisors is an integer number (67858561).

Almost surely, 2^135717121 is an apocalyptic number.

It is an amenable number.

135717121 is a deficient number, since it is larger than the sum of its proper divisors (1).

135717121 is an equidigital number, since it uses as much as digits as its factorization.

135717121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1470, while the sum is 28.

The square root of 135717121 is about 11649.7691393435. The cubic root of 135717121 is about 513.8995208518.

The spelling of 135717121 in words is "one hundred thirty-five million, seven hundred seventeen thousand, one hundred twenty-one".