505122321499981 has 4 divisors (see below), whose sum is σ = 534835399235292. Its totient is φ = 475409243764672.

The previous prime is 505122321499903. The next prime is 505122321500021. The reversal of 505122321499981 is 189994123221505.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 161540693737956 + 343581627762025 = 12709866^2 + 18535955^2 .

It is not a de Polignac number, because 505122321499981 - 2¹⁷ = 505122321368909 is a prime.

It is a super-2 number, since 2×505122321499981² (a number of 30 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (505122321499381) 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, 14856538867630 + ... + 14856538867663.

It is an arithmetic number, because the mean of its divisors is an integer number (133708849808823).

Almost surely, 2^{505122321499981} is an apocalyptic number.

It is an amenable number.

505122321499981 is a deficient number, since it is larger than the sum of its proper divisors (29713077735311).

505122321499981 is a wasteful number, since it uses less digits than its factorization.

505122321499981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29713077735310.

The product of its (nonzero) digits is 13996800, while the sum is 61.

The spelling of 505122321499981 in words is "five hundred five trillion, one hundred twenty-two billion, three hundred twenty-one million, four hundred ninety-nine thousand, nine hundred eighty-one".