1309797019991 has 2 divisors, whose sum is σ = 1309797019992. Its totient is φ = 1309797019990.

The previous prime is 1309797019967. The next prime is 1309797020033. The reversal of 1309797019991 is 1999107979031.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1309797019991 - 2³⁰ = 1308723278167 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1309797018991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 654898509995 + 654898509996.

It is an arithmetic number, because the mean of its divisors is an integer number (654898509996).

Almost surely, 2^{1309797019991} is an apocalyptic number.

1309797019991 is a deficient number, since it is larger than the sum of its proper divisors (1).

1309797019991 is an equidigital number, since it uses as much as digits as its factorization.

1309797019991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8680203, while the sum is 65.

The spelling of 1309797019991 in words is "one trillion, three hundred nine billion, seven hundred ninety-seven million, nineteen thousand, nine hundred ninety-one".