505243433281 has 2 divisors, whose sum is σ = 505243433282. Its totient is φ = 505243433280.

The previous prime is 505243433257. The next prime is 505243433291. The reversal of 505243433281 is 182334342505.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 308958105600 + 196285327681 = 555840^2 + 443041^2 .

It is a cyclic number.

It is not a de Polignac number, because 505243433281 - 2¹⁵ = 505243400513 is a prime.

It is a super-2 number, since 2×505243433281² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (505243433291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 252621716640 + 252621716641.

It is an arithmetic number, because the mean of its divisors is an integer number (252621716641).

Almost surely, 2^505243433281 is an apocalyptic number.

It is an amenable number.

505243433281 is a deficient number, since it is larger than the sum of its proper divisors (1).

505243433281 is an equidigital number, since it uses as much as digits as its factorization.

505243433281 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 345600, while the sum is 40.

Adding to 505243433281 its reverse (182334342505), we get a palindrome (687577775786).

The spelling of 505243433281 in words is "five hundred five billion, two hundred forty-three million, four hundred thirty-three thousand, two hundred eighty-one".