521001161 has 2 divisors, whose sum is σ = 521001162. Its totient is φ = 521001160.

The previous prime is 521001139. The next prime is 521001163. The reversal of 521001161 is 161100125.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 359329936 + 161671225 = 18956^2 + 12715^2 .

It is a cyclic number.

It is not a de Polignac number, because 521001161 - 2¹⁴ = 520984777 is a prime.

It is a Sophie Germain prime.

Together with 521001163, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (521001163) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 260500580 + 260500581.

It is an arithmetic number, because the mean of its divisors is an integer number (260500581).

Almost surely, 2^521001161 is an apocalyptic number.

It is an amenable number.

521001161 is a deficient number, since it is larger than the sum of its proper divisors (1).

521001161 is an equidigital number, since it uses as much as digits as its factorization.

521001161 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 60, while the sum is 17.

The square root of 521001161 is about 22825.4498531792. The cubic root of 521001161 is about 804.6608970004.

Adding to 521001161 its reverse (161100125), we get a palindrome (682101286).

The spelling of 521001161 in words is "five hundred twenty-one million, one thousand, one hundred sixty-one".