505235131 has 4 divisors (see below), whose sum is σ = 505300264. Its totient is φ = 505170000.

The previous prime is 505235063. The next prime is 505235149. The reversal of 505235131 is 131532505.

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 505235131 - 2²¹ = 503137979 is a prime.

It is a super-2 number, since 2×505235131² = 510525075193174322, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 505235096 and 505235105.

It is not an unprimeable number, because it can be changed into a prime (505235161) 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, 19065 + ... + 37066.

It is an arithmetic number, because the mean of its divisors is an integer number (126325066).

Almost surely, 2^505235131 is an apocalyptic number.

505235131 is a deficient number, since it is larger than the sum of its proper divisors (65133).

505235131 is an equidigital number, since it uses as much as digits as its factorization.

505235131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65132.

The product of its (nonzero) digits is 2250, while the sum is 25.

The square root of 505235131 is about 22477.4360415062. The cubic root of 505235131 is about 796.4609981471.

Adding to 505235131 its reverse (131532505), we get a palindrome (636767636).

The spelling of 505235131 in words is "five hundred five million, two hundred thirty-five thousand, one hundred thirty-one".