505000000391 has 8 divisors (see below), whose sum is σ = 540293358000. Its totient is φ = 470578083840.

The previous prime is 505000000381. The next prime is 505000000403. The reversal of 505000000391 is 193000000505.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 505000000391 - 2²⁶ = 504932891527 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (505000000381) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 217859066 + ... + 217861383.

It is an arithmetic number, because the mean of its divisors is an integer number (67536669750).

Almost surely, 2^505000000391 is an apocalyptic number.

505000000391 is a deficient number, since it is larger than the sum of its proper divisors (35293357609).

505000000391 is a wasteful number, since it uses less digits than its factorization.

505000000391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 435720529.

The product of its (nonzero) digits is 675, while the sum is 23.

Adding to 505000000391 its reverse (193000000505), we get a palindrome (698000000896).

The spelling of 505000000391 in words is "five hundred five billion, three hundred ninety-one", and thus it is an aban number.