505121205020131 has 6 divisors (see below), whose sum is σ = 587589973186740. Its totient is φ = 432961032874356.

The previous prime is 505121205020041. The next prime is 505121205020141. The reversal of 505121205020131 is 131020502121505.

It is a happy number.

It is not a de Polignac number, because 505121205020131 - 2¹¹ = 505121205018083 is a prime.

It is a super-2 number, since 2×505121205020131² (a number of 30 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 505121205020131.

It is not an unprimeable number, because it can be changed into a prime (505121205020141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5154298010361 + ... + 5154298010458.

It is an arithmetic number, because the mean of its divisors is an integer number (97931662197790).

Almost surely, 2^{505121205020131} is an apocalyptic number.

505121205020131 is a deficient number, since it is larger than the sum of its proper divisors (82468768166609).

505121205020131 is a wasteful number, since it uses less digits than its factorization.

505121205020131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10308596020833 (or 10308596020826 counting only the distinct ones).

The product of its (nonzero) digits is 3000, while the sum is 28.

Adding to 505121205020131 its reverse (131020502121505), we get a palindrome (636141707141636).

The spelling of 505121205020131 in words is "five hundred five trillion, one hundred twenty-one billion, two hundred five million, twenty thousand, one hundred thirty-one".