1920560820649 has 3 divisors (see below), whose sum is σ = 1920562206493. Its totient is φ = 1920559434806.

The previous prime is 1920560820583. The next prime is 1920560820667. The reversal of 1920560820649 is 9460280650291.

The square root of 1920560820649 is 1385843.

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

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 1920560820649 - 2²⁷ = 1920426602921 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1920560820596 and 1920560820605.

It is not an unprimeable number, because it can be changed into a prime (1920560820449) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 692922 + ... + 2078764.

Almost surely, 2^{1920560820649} is an apocalyptic number.

1920560820649 is the 1385843-rd square number.

1920560820649 is the 692922-nd centered octagonal number.

It is an amenable number.

1920560820649 is a deficient number, since it is larger than the sum of its proper divisors (1385844).

1920560820649 is an frugal number, since it uses more digits than its factorization.

1920560820649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2771686 (or 1385843 counting only the distinct ones).

The product of its (nonzero) digits is 1866240, while the sum is 52.

The spelling of 1920560820649 in words is "one trillion, nine hundred twenty billion, five hundred sixty million, eight hundred twenty thousand, six hundred forty-nine".