506643251 has 2 divisors, whose sum is σ = 506643252. Its totient is φ = 506643250.

The previous prime is 506643233. The next prime is 506643307. The reversal of 506643251 is 152346605.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 506643251 - 2¹⁸ = 506381107 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (506643451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 253321625 + 253321626.

It is an arithmetic number, because the mean of its divisors is an integer number (253321626).

Almost surely, 2^506643251 is an apocalyptic number.

506643251 is a deficient number, since it is larger than the sum of its proper divisors (1).

506643251 is an equidigital number, since it uses as much as digits as its factorization.

506643251 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 21600, while the sum is 32.

The square root of 506643251 is about 22508.7372146907. The cubic root of 506643251 is about 797.2002396705.

Adding to 506643251 its reverse (152346605), we get a palindrome (658989856).

The spelling of 506643251 in words is "five hundred six million, six hundred forty-three thousand, two hundred fifty-one".