200612561 has 2 divisors, whose sum is σ = 200612562. Its totient is φ = 200612560.

The previous prime is 200612543. The next prime is 200612569. The reversal of 200612561 is 165216002.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 153264400 + 47348161 = 12380^2 + 6881^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-200612561 is a prime.

It is not a weakly prime, because it can be changed into another prime (200612569) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100306280 + 100306281.

It is an arithmetic number, because the mean of its divisors is an integer number (100306281).

Almost surely, 2^200612561 is an apocalyptic number.

It is an amenable number.

200612561 is a deficient number, since it is larger than the sum of its proper divisors (1).

200612561 is an equidigital number, since it uses as much as digits as its factorization.

200612561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 200612561 is about 14163.7763679041. The cubic root of 200612561 is about 585.3999855420.

Adding to 200612561 its reverse (165216002), we get a palindrome (365828563).

It can be divided in two parts, 20061 and 2561, that added together give a palindrome (22622).

The spelling of 200612561 in words is "two hundred million, six hundred twelve thousand, five hundred sixty-one".