1321786441 has 2 divisors, whose sum is σ = 1321786442. Its totient is φ = 1321786440.

The previous prime is 1321786439. The next prime is 1321786469. The reversal of 1321786441 is 1446871231.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 952339600 + 369446841 = 30860^2 + 19221^2 .

It is a cyclic number.

It is not a de Polignac number, because 1321786441 - 2¹ = 1321786439 is a prime.

It is a super-2 number, since 2×1321786441² = 3494238791222892962, which contains 22 as substring.

Together with 1321786439, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 1321786441.

It is not a weakly prime, because it can be changed into another prime (1321786421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 660893220 + 660893221.

It is an arithmetic number, because the mean of its divisors is an integer number (660893221).

Almost surely, 2^1321786441 is an apocalyptic number.

It is an amenable number.

1321786441 is a deficient number, since it is larger than the sum of its proper divisors (1).

1321786441 is an equidigital number, since it uses as much as digits as its factorization.

1321786441 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 32256, while the sum is 37.

The square root of 1321786441 is about 36356.3810217684. The cubic root of 1321786441 is about 1097.4559502040.

The spelling of 1321786441 in words is "one billion, three hundred twenty-one million, seven hundred eighty-six thousand, four hundred forty-one".