135121594 has 4 divisors (see below), whose sum is σ = 202682394. Its totient is φ = 67560796.

The previous prime is 135121561. The next prime is 135121603. The reversal of 135121594 is 495121531.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 495121531 = 37 ⋅13381663.

It can be written as a sum of positive squares in only one way, i.e., 69105969 + 66015625 = 8313^2 + 8125^2 .

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 33780397 + ... + 33780400.

Almost surely, 2^135121594 is an apocalyptic number.

135121594 is a deficient number, since it is larger than the sum of its proper divisors (67560800).

135121594 is an equidigital number, since it uses as much as digits as its factorization.

135121594 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67560799.

The product of its digits is 5400, while the sum is 31.

The square root of 135121594 is about 11624.1814335462. The cubic root of 135121594 is about 513.1467546855.

The spelling of 135121594 in words is "one hundred thirty-five million, one hundred twenty-one thousand, five hundred ninety-four".