505131031 has 2 divisors, whose sum is σ = 505131032. Its totient is φ = 505131030.

The previous prime is 505131007. The next prime is 505131073. The reversal of 505131031 is 130131505.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 505131031 - 2⁹ = 505130519 is a prime.

It is a super-2 number, since 2×505131031² = 510314716958245922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (505131001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 252565515 + 252565516.

It is an arithmetic number, because the mean of its divisors is an integer number (252565516).

Almost surely, 2^505131031 is an apocalyptic number.

505131031 is a deficient number, since it is larger than the sum of its proper divisors (1).

505131031 is an equidigital number, since it uses as much as digits as its factorization.

505131031 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 225, while the sum is 19.

The square root of 505131031 is about 22475.1202666415. The cubic root of 505131031 is about 796.4062927371.

Adding to 505131031 its reverse (130131505), we get a palindrome (635262536).

The spelling of 505131031 in words is "five hundred five million, one hundred thirty-one thousand, thirty-one".