191709439412 has 6 divisors (see below), whose sum is σ = 335491518978. Its totient is φ = 95854719704.

The previous prime is 191709439409. The next prime is 191709439423. The reversal of 191709439412 is 214934907191.

191709439412 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 110492419216 + 81217020196 = 332404^2 + 284986^2 .

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 23963679923 + ... + 23963679930.

It is an arithmetic number, because the mean of its divisors is an integer number (55915253163).

Almost surely, 2^191709439412 is an apocalyptic number.

It is an amenable number.

191709439412 is a deficient number, since it is larger than the sum of its proper divisors (143782079566).

191709439412 is a wasteful number, since it uses less digits than its factorization.

191709439412 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47927359857 (or 47927359855 counting only the distinct ones).

The product of its (nonzero) digits is 489888, while the sum is 50.

The spelling of 191709439412 in words is "one hundred ninety-one billion, seven hundred nine million, four hundred thirty-nine thousand, four hundred twelve".