520007681 has 2 divisors, whose sum is σ = 520007682. Its totient is φ = 520007680.

The previous prime is 520007639. The next prime is 520007693. The reversal of 520007681 is 186700025.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 510760000 + 9247681 = 22600^2 + 3041^2 .

It is a cyclic number.

It is not a de Polignac number, because 520007681 - 2¹⁰ = 520006657 is a prime.

It is a super-2 number, since 2×520007681² = 540815976597995522, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (520001681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 260003840 + 260003841.

It is an arithmetic number, because the mean of its divisors is an integer number (260003841).

Almost surely, 2^520007681 is an apocalyptic number.

It is an amenable number.

520007681 is a deficient number, since it is larger than the sum of its proper divisors (1).

520007681 is an equidigital number, since it uses as much as digits as its factorization.

520007681 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3360, while the sum is 29.

The square root of 520007681 is about 22803.6769184270. The cubic root of 520007681 is about 804.1491110822.

The spelling of 520007681 in words is "five hundred twenty million, seven thousand, six hundred eighty-one".