502491391123 has 4 divisors (see below), whose sum is σ = 503167692528. Its totient is φ = 501815089720.

The previous prime is 502491391109. The next prime is 502491391177. The reversal of 502491391123 is 321193194205.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-502491391123 is a prime.

It is a super-2 number, since 2×502491391123² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (502491341123) 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, 338149588 + ... + 338151073.

It is an arithmetic number, because the mean of its divisors is an integer number (125791923132).

Almost surely, 2^502491391123 is an apocalyptic number.

502491391123 is a deficient number, since it is larger than the sum of its proper divisors (676301405).

502491391123 is an equidigital number, since it uses as much as digits as its factorization.

502491391123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 676301404.

The product of its (nonzero) digits is 58320, while the sum is 40.

The spelling of 502491391123 in words is "five hundred two billion, four hundred ninety-one million, three hundred ninety-one thousand, one hundred twenty-three".