1309380187949 has 16 divisors (see below), whose sum is σ = 1431182638080. Its totient is φ = 1192556494080.

The previous prime is 1309380187939. The next prime is 1309380187957. The reversal of 1309380187949 is 9497810839031.

It is a cyclic number.

It is not a de Polignac number, because 1309380187949 - 2³² = 1305085220653 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1309380187891 and 1309380187900.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1309380187939) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26150552 + ... + 26200574.

It is an arithmetic number, because the mean of its divisors is an integer number (89448914880).

Almost surely, 2^{1309380187949} is an apocalyptic number.

It is an amenable number.

1309380187949 is a deficient number, since it is larger than the sum of its proper divisors (121802450131).

1309380187949 is a wasteful number, since it uses less digits than its factorization.

1309380187949 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99740.

The product of its (nonzero) digits is 11757312, while the sum is 62.

The spelling of 1309380187949 in words is "one trillion, three hundred nine billion, three hundred eighty million, one hundred eighty-seven thousand, nine hundred forty-nine".