520678891 has 2 divisors, whose sum is σ = 520678892. Its totient is φ = 520678890.

The previous prime is 520678889. The next prime is 520678897. The reversal of 520678891 is 198876025.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 520678891 - 2¹ = 520678889 is a prime.

It is a super-2 number, since 2×520678891² = 542213015065979762, which contains 22 as substring.

Together with 520678889, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (520678897) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 260339445 + 260339446.

It is an arithmetic number, because the mean of its divisors is an integer number (260339446).

Almost surely, 2^520678891 is an apocalyptic number.

520678891 is a deficient number, since it is larger than the sum of its proper divisors (1).

520678891 is an equidigital number, since it uses as much as digits as its factorization.

520678891 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 241920, while the sum is 46.

The square root of 520678891 is about 22818.3893165140. The cubic root of 520678891 is about 804.4949526783.

The spelling of 520678891 in words is "five hundred twenty million, six hundred seventy-eight thousand, eight hundred ninety-one".