1912817105 has 8 divisors (see below), whose sum is σ = 2315694312. Its totient is φ = 1516711168.

The previous prime is 1912817051. The next prime is 1912817131. The reversal of 1912817105 is 5017182191.

It can be written as a sum of positive squares in 4 ways, for example, as 4787344 + 1908029761 = 2188^2 + 43681^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1912817105 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1692194 + ... + 1693323.

It is an arithmetic number, because the mean of its divisors is an integer number (289461789).

Almost surely, 2^1912817105 is an apocalyptic number.

It is an amenable number.

1912817105 is a deficient number, since it is larger than the sum of its proper divisors (402877207).

1912817105 is a wasteful number, since it uses less digits than its factorization.

1912817105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3385635.

The product of its (nonzero) digits is 5040, while the sum is 35.

The square root of 1912817105 is about 43735.7645983239. The cubic root of 1912817105 is about 1241.3411402149.

Adding to 1912817105 its reverse (5017182191), we get a palindrome (6929999296).

The spelling of 1912817105 in words is "one billion, nine hundred twelve million, eight hundred seventeen thousand, one hundred five".