520142135 has 4 divisors (see below), whose sum is σ = 624170568. Its totient is φ = 416113704.

The previous prime is 520142123. The next prime is 520142143. The reversal of 520142135 is 531241025.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 520142135 - 2¹⁴ = 520125751 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 520142135.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 52014209 + ... + 52014218.

It is an arithmetic number, because the mean of its divisors is an integer number (156042642).

Almost surely, 2^520142135 is an apocalyptic number.

520142135 is a deficient number, since it is larger than the sum of its proper divisors (104028433).

520142135 is a wasteful number, since it uses less digits than its factorization.

520142135 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104028432.

The product of its (nonzero) digits is 1200, while the sum is 23.

The square root of 520142135 is about 22806.6248050868. The cubic root of 520142135 is about 804.2184124607.

The spelling of 520142135 in words is "five hundred twenty million, one hundred forty-two thousand, one hundred thirty-five".