521161 has 2 divisors, whose sum is σ = 521162. Its totient is φ = 521160.

The previous prime is 521153. The next prime is 521167. The reversal of 521161 is 161125.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 455625 + 65536 = 675^2 + 256^2 .

It is a cyclic number.

It is not a de Polignac number, because 521161 - 2³ = 521153 is a prime.

It is not a weakly prime, because it can be changed into another prime (521167) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 260580 + 260581.

It is an arithmetic number, because the mean of its divisors is an integer number (260581).

2⁵²¹¹⁶¹ is an apocalyptic number.

It is an amenable number.

521161 is a deficient number, since it is larger than the sum of its proper divisors (1).

521161 is an equidigital number, since it uses as much as digits as its factorization.

521161 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 60, while the sum is 16.

The square root of 521161 is about 721.9148149193. The cubic root of 521161 is about 80.4743176435.

Adding to 521161 its reverse (161125), we get a palindrome (682286).

The spelling of 521161 in words is "five hundred twenty-one thousand, one hundred sixty-one".