521200345 has 4 divisors (see below), whose sum is σ = 625440420. Its totient is φ = 416960272.

The previous prime is 521200319. The next prime is 521200349. The reversal of 521200345 is 543002125.

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 168662169 + 352538176 = 12987^2 + 18776^2 .

It is a cyclic number.

It is not a de Polignac number, because 521200345 - 2¹¹ = 521198297 is a prime.

It is not an unprimeable number, because it can be changed into a prime (521200349) 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, 52120030 + ... + 52120039.

It is an arithmetic number, because the mean of its divisors is an integer number (156360105).

Almost surely, 2^521200345 is an apocalyptic number.

It is an amenable number.

521200345 is a deficient number, since it is larger than the sum of its proper divisors (104240075).

521200345 is a wasteful number, since it uses less digits than its factorization.

521200345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104240074.

The product of its (nonzero) digits is 1200, while the sum is 22.

The square root of 521200345 is about 22829.8126361125. The cubic root of 521200345 is about 804.7634272617.

The spelling of 521200345 in words is "five hundred twenty-one million, two hundred thousand, three hundred forty-five".