1912110949681 has 9 divisors (see below), whose sum is σ = 1931371253419. Its totient is φ = 1893040879000.

The previous prime is 1912110949673. The next prime is 1912110949711. The reversal of 1912110949681 is 1869490112191.

It is a happy number.

The square root of 1912110949681 is 1382791.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 1837133557281 + 74977392400 = 1355409^2 + 273820^2 .

It is not a de Polignac number, because 1912110949681 - 2³ = 1912110949673 is a prime.

It is a super-2 number, since 2×1912110949681² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1912110949481) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 139655046 + ... + 139668736.

Almost surely, 2^{1912110949681} is an apocalyptic number.

1912110949681 is the 1382791-st square number.

1912110949681 is the 691396-th centered octagonal number.

It is an amenable number.

1912110949681 is a deficient number, since it is larger than the sum of its proper divisors (19260303738).

1912110949681 is an frugal number, since it uses more digits than its factorization.

1912110949681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27584 (or 13792 counting only the distinct ones).

The product of its (nonzero) digits is 279936, while the sum is 52.

The spelling of 1912110949681 in words is "one trillion, nine hundred twelve billion, one hundred ten million, nine hundred forty-nine thousand, six hundred eighty-one".