520021093 has 2 divisors, whose sum is σ = 520021094. Its totient is φ = 520021092.

The previous prime is 520021079. The next prime is 520021189. The reversal of 520021093 is 390120025.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 518336289 + 1684804 = 22767^2 + 1298^2 .

It is a cyclic number.

It is not a de Polignac number, because 520021093 - 2²¹ = 517923941 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (520021493) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 260010546 + 260010547.

It is an arithmetic number, because the mean of its divisors is an integer number (260010547).

Almost surely, 2^520021093 is an apocalyptic number.

It is an amenable number.

520021093 is a deficient number, since it is larger than the sum of its proper divisors (1).

520021093 is an equidigital number, since it uses as much as digits as its factorization.

520021093 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 540, while the sum is 22.

The square root of 520021093 is about 22803.9709919128. The cubic root of 520021093 is about 804.1560245411.

The spelling of 520021093 in words is "five hundred twenty million, twenty-one thousand, ninety-three".