1321411440509 has 2 divisors, whose sum is σ = 1321411440510. Its totient is φ = 1321411440508.

The previous prime is 1321411440409. The next prime is 1321411440511. The reversal of 1321411440509 is 9050441141231.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1236877622500 + 84533818009 = 1112150^2 + 290747^2 .

It is a cyclic number.

It is not a de Polignac number, because 1321411440509 - 2⁸ = 1321411440253 is a prime.

It is a super-2 number, since 2×1321411440509² (a number of 25 digits) contains 22 as substring.

Together with 1321411440511, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1321411440409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 660705720254 + 660705720255.

It is an arithmetic number, because the mean of its divisors is an integer number (660705720255).

Almost surely, 2^{1321411440509} is an apocalyptic number.

It is an amenable number.

1321411440509 is a deficient number, since it is larger than the sum of its proper divisors (1).

1321411440509 is an equidigital number, since it uses as much as digits as its factorization.

1321411440509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 17280, while the sum is 35.

The spelling of 1321411440509 in words is "one trillion, three hundred twenty-one billion, four hundred eleven million, four hundred forty thousand, five hundred nine".