520550069 has 4 divisors (see below), whose sum is σ = 560592396. Its totient is φ = 480507744.

The previous prime is 520550033. The next prime is 520550137. The reversal of 520550069 is 960055025.

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 20133169 + 500416900 = 4487^2 + 22370^2 .

It is a cyclic number.

It is not a de Polignac number, because 520550069 - 2¹² = 520545973 is a prime.

It is a super-2 number, since 2×520550069² = 541944748671809522, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (520552069) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20021144 + ... + 20021169.

It is an arithmetic number, because the mean of its divisors is an integer number (140148099).

Almost surely, 2^520550069 is an apocalyptic number.

It is an amenable number.

520550069 is a deficient number, since it is larger than the sum of its proper divisors (40042327).

520550069 is a wasteful number, since it uses less digits than its factorization.

520550069 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40042326.

The product of its (nonzero) digits is 13500, while the sum is 32.

The square root of 520550069 is about 22815.5663747364. The cubic root of 520550069 is about 804.4286000767.

The spelling of 520550069 in words is "five hundred twenty million, five hundred fifty thousand, sixty-nine".