505871031 has 4 divisors (see below), whose sum is σ = 674494712. Its totient is φ = 337247352.

The previous prime is 505871027. The next prime is 505871059. The reversal of 505871031 is 130178505.

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

It is not a de Polignac number, because 505871031 - 2² = 505871027 is a prime.

It is a super-2 number, since 2×505871031² = 511811000010005922, which contains 22 as substring.

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 505871031.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (505871021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 84311836 + ... + 84311841.

It is an arithmetic number, because the mean of its divisors is an integer number (168623678).

Almost surely, 2^505871031 is an apocalyptic number.

505871031 is a deficient number, since it is larger than the sum of its proper divisors (168623681).

505871031 is a wasteful number, since it uses less digits than its factorization.

505871031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 168623680.

The product of its (nonzero) digits is 4200, while the sum is 30.

The square root of 505871031 is about 22491.5768900271. The cubic root of 505871031 is about 796.7950058078.

The spelling of 505871031 in words is "five hundred five million, eight hundred seventy-one thousand, thirty-one".