1321163731289 has 2 divisors, whose sum is σ = 1321163731290. Its totient is φ = 1321163731288.

The previous prime is 1321163731253. The next prime is 1321163731297. The reversal of 1321163731289 is 9821373611231.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1119120673225 + 202043058064 = 1057885^2 + 449492^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1321163731289 is a prime.

It is not a weakly prime, because it can be changed into another prime (1321163731889) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 660581865644 + 660581865645.

It is an arithmetic number, because the mean of its divisors is an integer number (660581865645).

Almost surely, 2^{1321163731289} is an apocalyptic number.

It is an amenable number.

1321163731289 is a deficient number, since it is larger than the sum of its proper divisors (1).

1321163731289 is an equidigital number, since it uses as much as digits as its factorization.

1321163731289 is an evil number, because the sum of its binary digits is even.

The product of its digits is 326592, while the sum is 47.

The spelling of 1321163731289 in words is "one trillion, three hundred twenty-one billion, one hundred sixty-three million, seven hundred thirty-one thousand, two hundred eighty-nine".