520778893 has 2 divisors, whose sum is σ = 520778894. Its totient is φ = 520778892.

The previous prime is 520778887. The next prime is 520778911. The reversal of 520778893 is 398877025.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 514291684 + 6487209 = 22678^2 + 2547^2 .

It is a cyclic number.

It is not a de Polignac number, because 520778893 - 2²⁵ = 487224461 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (520779893) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 260389446 + 260389447.

It is an arithmetic number, because the mean of its divisors is an integer number (260389447).

Almost surely, 2^520778893 is an apocalyptic number.

It is an amenable number.

520778893 is a deficient number, since it is larger than the sum of its proper divisors (1).

520778893 is an equidigital number, since it uses as much as digits as its factorization.

520778893 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 846720, while the sum is 49.

The square root of 520778893 is about 22820.5804702685. The cubic root of 520778893 is about 804.5464533605.

It can be divided in two parts, 5207 and 78893, that added together give a square (84100 = 290²).

The spelling of 520778893 in words is "five hundred twenty million, seven hundred seventy-eight thousand, eight hundred ninety-three".