1327879661 has 2 divisors, whose sum is σ = 1327879662. Its totient is φ = 1327879660.

The previous prime is 1327879583. The next prime is 1327879667. The reversal of 1327879661 is 1669787231.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 954192100 + 373687561 = 30890^2 + 19331^2 .

It is a cyclic number.

It is not a de Polignac number, because 1327879661 - 2¹⁸ = 1327617517 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1327879667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 663939830 + 663939831.

It is an arithmetic number, because the mean of its divisors is an integer number (663939831).

Almost surely, 2^1327879661 is an apocalyptic number.

It is an amenable number.

1327879661 is a deficient number, since it is larger than the sum of its proper divisors (1).

1327879661 is an equidigital number, since it uses as much as digits as its factorization.

1327879661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 762048, while the sum is 50.

The square root of 1327879661 is about 36440.0831640105. The cubic root of 1327879661 is about 1099.1397298686.

The spelling of 1327879661 in words is "one billion, three hundred twenty-seven million, eight hundred seventy-nine thousand, six hundred sixty-one".