1909125705412 has 6 divisors (see below), whose sum is σ = 3340969984478. Its totient is φ = 954562852704.

The previous prime is 1909125705349. The next prime is 1909125705413. The reversal of 1909125705412 is 2145075219091.

It can be written as a sum of positive squares in only one way, i.e., 1495298534976 + 413827170436 = 1222824^2 + 643294^2 .

It is not an unprimeable number, because it can be changed into a prime (1909125705413) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 238640713173 + ... + 238640713180.

Almost surely, 2^{1909125705412} is an apocalyptic number.

It is an amenable number.

1909125705412 is a deficient number, since it is larger than the sum of its proper divisors (1431844279066).

1909125705412 is a wasteful number, since it uses less digits than its factorization.

1909125705412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 477281426357 (or 477281426355 counting only the distinct ones).

The product of its (nonzero) digits is 226800, while the sum is 46.

The spelling of 1909125705412 in words is "one trillion, nine hundred nine billion, one hundred twenty-five million, seven hundred five thousand, four hundred twelve".