505431310361 has 4 divisors (see below), whose sum is σ = 513997942800. Its totient is φ = 496864677924.

The previous prime is 505431310331. The next prime is 505431310381. The reversal of 505431310361 is 163013134505.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 505431310361 - 2¹⁸ = 505431048217 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (505431310331) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4283316131 + ... + 4283316248.

It is an arithmetic number, because the mean of its divisors is an integer number (128499485700).

Almost surely, 2^505431310361 is an apocalyptic number.

It is an amenable number.

505431310361 is a deficient number, since it is larger than the sum of its proper divisors (8566632439).

505431310361 is an equidigital number, since it uses as much as digits as its factorization.

505431310361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8566632438.

The product of its (nonzero) digits is 16200, while the sum is 32.

Adding to 505431310361 its reverse (163013134505), we get a palindrome (668444444866).

The spelling of 505431310361 in words is "five hundred five billion, four hundred thirty-one million, three hundred ten thousand, three hundred sixty-one".