521601217 has 2 divisors, whose sum is σ = 521601218. Its totient is φ = 521601216.

The previous prime is 521601211. The next prime is 521601233. The reversal of 521601217 is 712106125.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 347598736 + 174002481 = 18644^2 + 13191^2 .

It is a cyclic number.

It is not a de Polignac number, because 521601217 - 2³ = 521601209 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 521601191 and 521601200.

It is not a weakly prime, because it can be changed into another prime (521601211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 260800608 + 260800609.

It is an arithmetic number, because the mean of its divisors is an integer number (260800609).

Almost surely, 2^521601217 is an apocalyptic number.

It is an amenable number.

521601217 is a deficient number, since it is larger than the sum of its proper divisors (1).

521601217 is an equidigital number, since it uses as much as digits as its factorization.

521601217 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 840, while the sum is 25.

The square root of 521601217 is about 22838.5905213084. The cubic root of 521601217 is about 804.9696975592.

The spelling of 521601217 in words is "five hundred twenty-one million, six hundred one thousand, two hundred seventeen".