1909125705349 has 2 divisors, whose sum is σ = 1909125705350. Its totient is φ = 1909125705348.

The previous prime is 1909125705341. The next prime is 1909125705413. The reversal of 1909125705349 is 9435075219091.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1371920264100 + 537205441249 = 1171290^2 + 732943^2 .

It is a cyclic number.

It is not a de Polignac number, because 1909125705349 - 2³ = 1909125705341 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1909125705349.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1909125705341) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 954562852674 + 954562852675.

It is an arithmetic number, because the mean of its divisors is an integer number (954562852675).

Almost surely, 2^{1909125705349} is an apocalyptic number.

It is an amenable number.

1909125705349 is a deficient number, since it is larger than the sum of its proper divisors (1).

1909125705349 is an equidigital number, since it uses as much as digits as its factorization.

1909125705349 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3061800, while the sum is 55.

The spelling of 1909125705349 in words is "one trillion, nine hundred nine billion, one hundred twenty-five million, seven hundred five thousand, three hundred forty-nine".