520021279 has 16 divisors (see below), whose sum is σ = 589114080. Its totient is φ = 456053760.

The previous prime is 520021277. The next prime is 520021289. The reversal of 520021279 is 972120025.

It is a cyclic number.

It is not a de Polignac number, because 520021279 - 2¹ = 520021277 is a prime.

It is a super-2 number, since 2×520021279² = 540844261225591682, 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 (520021277) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6507 + ... + 32899.

It is an arithmetic number, because the mean of its divisors is an integer number (36819630).

Almost surely, 2^520021279 is an apocalyptic number.

520021279 is a deficient number, since it is larger than the sum of its proper divisors (69092801).

520021279 is a wasteful number, since it uses less digits than its factorization.

520021279 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26490.

The product of its (nonzero) digits is 2520, while the sum is 28.

The square root of 520021279 is about 22803.9750701495. The cubic root of 520021279 is about 804.1561204174.

The spelling of 520021279 in words is "five hundred twenty million, twenty-one thousand, two hundred seventy-nine".