130555561 has 2 divisors, whose sum is σ = 130555562. Its totient is φ = 130555560.

The previous prime is 130555549. The next prime is 130555577. The reversal of 130555561 is 165555031.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 123899161 + 6656400 = 11131^2 + 2580^2 .

It is a cyclic number.

It is not a de Polignac number, because 130555561 - 2¹¹ = 130553513 is a prime.

It is not a weakly prime, because it can be changed into another prime (130555531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65277780 + 65277781.

It is an arithmetic number, because the mean of its divisors is an integer number (65277781).

Almost surely, 2^130555561 is an apocalyptic number.

It is an amenable number.

130555561 is a deficient number, since it is larger than the sum of its proper divisors (1).

130555561 is an equidigital number, since it uses as much as digits as its factorization.

130555561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11250, while the sum is 31.

The square root of 130555561 is about 11426.0912389146. The cubic root of 130555561 is about 507.3003069488.

The spelling of 130555561 in words is "one hundred thirty million, five hundred fifty-five thousand, five hundred sixty-one".