130205561 has 2 divisors, whose sum is σ = 130205562. Its totient is φ = 130205560.

The previous prime is 130205539. The next prime is 130205597. The reversal of 130205561 is 165502031.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 74926336 + 55279225 = 8656^2 + 7435^2 .

It is a cyclic number.

It is not a de Polignac number, because 130205561 - 2¹⁰ = 130204537 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (130205521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65102780 + 65102781.

It is an arithmetic number, because the mean of its divisors is an integer number (65102781).

Almost surely, 2^130205561 is an apocalyptic number.

It is an amenable number.

130205561 is a deficient number, since it is larger than the sum of its proper divisors (1).

130205561 is an equidigital number, since it uses as much as digits as its factorization.

130205561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 900, while the sum is 23.

The square root of 130205561 is about 11410.7651364841. The cubic root of 130205561 is about 506.8465690688.

Adding to 130205561 its reverse (165502031), we get a palindrome (295707592).

It can be divided in two parts, 13020 and 5561, that added together give a palindrome (18581).

The spelling of 130205561 in words is "one hundred thirty million, two hundred five thousand, five hundred sixty-one".