506426431261 has 2 divisors, whose sum is σ = 506426431262. Its totient is φ = 506426431260.

The previous prime is 506426431219. The next prime is 506426431279. The reversal of 506426431261 is 162134624605.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 493830858361 + 12595572900 = 702731^2 + 112230^2 .

It is a cyclic number.

It is not a de Polignac number, because 506426431261 - 2²¹ = 506424334109 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (506426431961) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 253213215630 + 253213215631.

It is an arithmetic number, because the mean of its divisors is an integer number (253213215631).

Almost surely, 2^506426431261 is an apocalyptic number.

It is an amenable number.

506426431261 is a deficient number, since it is larger than the sum of its proper divisors (1).

506426431261 is an equidigital number, since it uses as much as digits as its factorization.

506426431261 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 207360, while the sum is 40.

The spelling of 506426431261 in words is "five hundred six billion, four hundred twenty-six million, four hundred thirty-one thousand, two hundred sixty-one".