1327446781 has 2 divisors, whose sum is σ = 1327446782. Its totient is φ = 1327446780.

The previous prime is 1327446779. The next prime is 1327446797. The reversal of 1327446781 is 1876447231.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 695376900 + 632069881 = 26370^2 + 25141^2 .

It is a cyclic number.

It is not a de Polignac number, because 1327446781 - 2¹ = 1327446779 is a prime.

It is a super-2 number, since 2×1327446781² = 3524229912774523922, which contains 22 as substring.

Together with 1327446779, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1327446721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 663723390 + 663723391.

It is an arithmetic number, because the mean of its divisors is an integer number (663723391).

Almost surely, 2^1327446781 is an apocalyptic number.

It is an amenable number.

1327446781 is a deficient number, since it is larger than the sum of its proper divisors (1).

1327446781 is an equidigital number, since it uses as much as digits as its factorization.

1327446781 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 225792, while the sum is 43.

The square root of 1327446781 is about 36434.1430666346. The cubic root of 1327446781 is about 1099.0202794567.

The spelling of 1327446781 in words is "one billion, three hundred twenty-seven million, four hundred forty-six thousand, seven hundred eighty-one".