135121975 has 6 divisors (see below), whose sum is σ = 167551280. Its totient is φ = 108097560.

The previous prime is 135121927. The next prime is 135121979. The reversal of 135121975 is 579121531.

It is not a de Polignac number, because 135121975 - 2¹⁷ = 134990903 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 135121975.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (135121979) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2702415 + ... + 2702464.

Almost surely, 2^135121975 is an apocalyptic number.

135121975 is a deficient number, since it is larger than the sum of its proper divisors (32429305).

135121975 is an equidigital number, since it uses as much as digits as its factorization.

135121975 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5404889 (or 5404884 counting only the distinct ones).

The product of its digits is 9450, while the sum is 34.

The square root of 135121975 is about 11624.1978217854. The cubic root of 135121975 is about 513.1472369887.

The spelling of 135121975 in words is "one hundred thirty-five million, one hundred twenty-one thousand, nine hundred seventy-five".