505108139 has 4 divisors (see below), whose sum is σ = 505462056. Its totient is φ = 504754224.

The previous prime is 505108091. The next prime is 505108147. The reversal of 505108139 is 931801505.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-505108139 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (505101139) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 174809 + ... + 177674.

It is an arithmetic number, because the mean of its divisors is an integer number (126365514).

Almost surely, 2^505108139 is an apocalyptic number.

505108139 is a deficient number, since it is larger than the sum of its proper divisors (353917).

505108139 is a wasteful number, since it uses less digits than its factorization.

505108139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 353916.

The product of its (nonzero) digits is 5400, while the sum is 32.

The square root of 505108139 is about 22474.6109866222. The cubic root of 505108139 is about 796.3942617939.

The spelling of 505108139 in words is "five hundred five million, one hundred eight thousand, one hundred thirty-nine".