135121087 has 4 divisors (see below), whose sum is σ = 136360840. Its totient is φ = 133881336.

The previous prime is 135121073. The next prime is 135121123. The reversal of 135121087 is 780121531.

135121087 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 780121531 = 7 ⋅111445933.

It is a cyclic number.

It is not a de Polignac number, because 135121087 - 2¹⁹ = 134596799 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (135121057) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 619713 + ... + 619930.

It is an arithmetic number, because the mean of its divisors is an integer number (34090210).

Almost surely, 2^135121087 is an apocalyptic number.

135121087 is a deficient number, since it is larger than the sum of its proper divisors (1239753).

135121087 is a wasteful number, since it uses less digits than its factorization.

135121087 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1239752.

The product of its (nonzero) digits is 1680, while the sum is 28.

The square root of 135121087 is about 11624.1596255385. The cubic root of 135121087 is about 513.1461128791.

The spelling of 135121087 in words is "one hundred thirty-five million, one hundred twenty-one thousand, eighty-seven".