1327616561 has 2 divisors, whose sum is σ = 1327616562. Its totient is φ = 1327616560.

The previous prime is 1327616539. The next prime is 1327616579. The reversal of 1327616561 is 1656167231.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1034008336 + 293608225 = 32156^2 + 17135^2 .

It is a cyclic number.

It is not a de Polignac number, because 1327616561 - 2¹⁸ = 1327354417 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (1327616501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 663808280 + 663808281.

It is an arithmetic number, because the mean of its divisors is an integer number (663808281).

Almost surely, 2^1327616561 is an apocalyptic number.

It is an amenable number.

1327616561 is a deficient number, since it is larger than the sum of its proper divisors (1).

1327616561 is an equidigital number, since it uses as much as digits as its factorization.

1327616561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 45360, while the sum is 38.

The square root of 1327616561 is about 36436.4729495049. The cubic root of 1327616561 is about 1099.0671322348.

The spelling of 1327616561 in words is "one billion, three hundred twenty-seven million, six hundred sixteen thousand, five hundred sixty-one".