505223131999 has 4 divisors (see below), whose sum is σ = 505241331336. Its totient is φ = 505204932664.

The previous prime is 505223131981. The next prime is 505223132023. The reversal of 505223131999 is 999131322505.

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 505223131999 - 2¹⁵ = 505223099231 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (505223131939) 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, 9057964 + ... + 9113569.

It is an arithmetic number, because the mean of its divisors is an integer number (126310332834).

Almost surely, 2^505223131999 is an apocalyptic number.

505223131999 is a deficient number, since it is larger than the sum of its proper divisors (18199337).

505223131999 is a wasteful number, since it uses less digits than its factorization.

505223131999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18199336.

The product of its (nonzero) digits is 656100, while the sum is 49.

The spelling of 505223131999 in words is "five hundred five billion, two hundred twenty-three million, one hundred thirty-one thousand, nine hundred ninety-nine".