2000521561 has 2 divisors, whose sum is σ = 2000521562. Its totient is φ = 2000521560.

The previous prime is 2000521507. The next prime is 2000521573. The reversal of 2000521561 is 1651250002.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1876622400 + 123899161 = 43320^2 + 11131^2 .

It is a cyclic number.

It is not a de Polignac number, because 2000521561 - 2⁷ = 2000521433 is a prime.

It is not a weakly prime, because it can be changed into another prime (2090521561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1000260780 + 1000260781.

It is an arithmetic number, because the mean of its divisors is an integer number (1000260781).

Almost surely, 2^2000521561 is an apocalyptic number.

It is an amenable number.

2000521561 is a deficient number, since it is larger than the sum of its proper divisors (1).

2000521561 is an equidigital number, since it uses as much as digits as its factorization.

2000521561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 600, while the sum is 22.

The square root of 2000521561 is about 44727.1903991297. The cubic root of 2000521561 is about 1260.0305613231.

Adding to 2000521561 its reverse (1651250002), we get a palindrome (3651771563).

The spelling of 2000521561 in words is "two billion, five hundred twenty-one thousand, five hundred sixty-one".