1309380187939 has 2 divisors, whose sum is σ = 1309380187940. Its totient is φ = 1309380187938.

The previous prime is 1309380187937. The next prime is 1309380187957. The reversal of 1309380187939 is 9397810839031.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1309380187939 - 2¹ = 1309380187937 is a prime.

It is a super-2 number, since 2×1309380187939² (a number of 25 digits) contains 22 as substring.

Together with 1309380187937, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1309380187931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 654690093969 + 654690093970.

It is an arithmetic number, because the mean of its divisors is an integer number (654690093970).

Almost surely, 2^{1309380187939} is an apocalyptic number.

1309380187939 is a deficient number, since it is larger than the sum of its proper divisors (1).

1309380187939 is an equidigital number, since it uses as much as digits as its factorization.

1309380187939 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8817984, while the sum is 61.

The spelling of 1309380187939 in words is "one trillion, three hundred nine billion, three hundred eighty million, one hundred eighty-seven thousand, nine hundred thirty-nine".