520644893 has 2 divisors, whose sum is σ = 520644894. Its totient is φ = 520644892.

The previous prime is 520644869. The next prime is 520644923. The reversal of 520644893 is 398446025.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 493417369 + 27227524 = 22213^2 + 5218^2 .

It is a cyclic number.

It is not a de Polignac number, because 520644893 - 2⁸ = 520644637 is a prime.

It is a super-2 number, since 2×520644893² = 542142209213962898, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 520644893.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (520644853) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 260322446 + 260322447.

It is an arithmetic number, because the mean of its divisors is an integer number (260322447).

Almost surely, 2^520644893 is an apocalyptic number.

It is an amenable number.

520644893 is a deficient number, since it is larger than the sum of its proper divisors (1).

520644893 is an equidigital number, since it uses as much as digits as its factorization.

520644893 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 207360, while the sum is 41.

The square root of 520644893 is about 22817.6443350316. The cubic root of 520644893 is about 804.4774423245.

The spelling of 520644893 in words is "five hundred twenty million, six hundred forty-four thousand, eight hundred ninety-three".