521516201 has 4 divisors (see below), whose sum is σ = 521897412. Its totient is φ = 521134992.

The previous prime is 521516197. The next prime is 521516213. The reversal of 521516201 is 102615125.

It is a happy number.

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 296666176 + 224850025 = 17224^2 + 14995^2 .

It is a cyclic number.

It is not a de Polignac number, because 521516201 - 2² = 521516197 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (521516101) 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, 188546 + ... + 191291.

It is an arithmetic number, because the mean of its divisors is an integer number (130474353).

Almost surely, 2^521516201 is an apocalyptic number.

It is an amenable number.

521516201 is a deficient number, since it is larger than the sum of its proper divisors (381211).

521516201 is a wasteful number, since it uses less digits than its factorization.

521516201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 381210.

The product of its (nonzero) digits is 600, while the sum is 23.

The square root of 521516201 is about 22836.7292097621. The cubic root of 521516201 is about 804.9259610673.

The spelling of 521516201 in words is "five hundred twenty-one million, five hundred sixteen thousand, two hundred one".