520213493 has 4 divisors (see below), whose sum is σ = 520529100. Its totient is φ = 519897888.

The previous prime is 520213487. The next prime is 520213543. The reversal of 520213493 is 394312025.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 315666289 + 204547204 = 17767^2 + 14302^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-520213493 is a prime.

It is a super-2 number, since 2×520213493² = 541244156598522098, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (520213423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 155318 + ... + 158631.

It is an arithmetic number, because the mean of its divisors is an integer number (130132275).

Almost surely, 2^520213493 is an apocalyptic number.

It is an amenable number.

520213493 is a deficient number, since it is larger than the sum of its proper divisors (315607).

520213493 is a wasteful number, since it uses less digits than its factorization.

520213493 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 315606.

The product of its (nonzero) digits is 6480, while the sum is 29.

The square root of 520213493 is about 22808.1891652976. The cubic root of 520213493 is about 804.2551875326.

The spelling of 520213493 in words is "five hundred twenty million, two hundred thirteen thousand, four hundred ninety-three".