506240681 has 2 divisors, whose sum is σ = 506240682. Its totient is φ = 506240680.

The previous prime is 506240663. The next prime is 506240687. The reversal of 506240681 is 186042605.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 298736656 + 207504025 = 17284^2 + 14405^2 .

It is a cyclic number.

It is not a de Polignac number, because 506240681 - 2¹⁸ = 505978537 is a prime.

It is a super-2 number, since 2×506240681² = 512559254198687522, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (506240687) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 253120340 + 253120341.

It is an arithmetic number, because the mean of its divisors is an integer number (253120341).

Almost surely, 2^506240681 is an apocalyptic number.

It is an amenable number.

506240681 is a deficient number, since it is larger than the sum of its proper divisors (1).

506240681 is an equidigital number, since it uses as much as digits as its factorization.

506240681 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11520, while the sum is 32.

The square root of 506240681 is about 22499.7929101581. The cubic root of 506240681 is about 796.9890365285.

The spelling of 506240681 in words is "five hundred six million, two hundred forty thousand, six hundred eighty-one".