1321768841 has 4 divisors (see below), whose sum is σ = 1322877972. Its totient is φ = 1320659712.

The previous prime is 1321768837. The next prime is 1321768849. The reversal of 1321768841 is 1488671231.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1488671231 = 9511 ⋅156521.

It can be written as a sum of positive squares in 2 ways, for example, as 428655616 + 893113225 = 20704^2 + 29885^2 .

It is a cyclic number.

It is not a de Polignac number, because 1321768841 - 2² = 1321768837 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1321768849) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 552776 + ... + 555161.

It is an arithmetic number, because the mean of its divisors is an integer number (330719493).

Almost surely, 2^1321768841 is an apocalyptic number.

It is an amenable number.

1321768841 is a deficient number, since it is larger than the sum of its proper divisors (1109131).

1321768841 is a wasteful number, since it uses less digits than its factorization.

1321768841 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1109130.

The product of its digits is 64512, while the sum is 41.

The square root of 1321768841 is about 36356.1389726687. The cubic root of 1321768841 is about 1097.4510791926.

The spelling of 1321768841 in words is "one billion, three hundred twenty-one million, seven hundred sixty-eight thousand, eight hundred forty-one".