1549171047649 has 9 divisors (see below), whose sum is σ = 1557480937593. Its totient is φ = 1540905280512.

The previous prime is 1549171047637. The next prime is 1549171047653. The reversal of 1549171047649 is 9467401719451.

The square root of 1549171047649 is 1244657.

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

It can be written as a sum of positive squares in 4 ways, for example, as 172378584225 + 1376792463424 = 415185^2 + 1173368^2 .

It is not a de Polignac number, because 1549171047649 - 2¹¹ = 1549171045601 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1549171047593 and 1549171047602.

It is not an unprimeable number, because it can be changed into a prime (1549171047049) 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, 240215577 + ... + 240222025.

Almost surely, 2^{1549171047649} is an apocalyptic number.

1549171047649 is the 1244657-th square number.

1549171047649 is the 622329-th centered octagonal number.

It is an amenable number.

1549171047649 is a deficient number, since it is larger than the sum of its proper divisors (8309889944).

1549171047649 is an frugal number, since it uses more digits than its factorization.

1549171047649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13284 (or 6642 counting only the distinct ones).

The product of its (nonzero) digits is 7620480, while the sum is 58.

The spelling of 1549171047649 in words is "one trillion, five hundred forty-nine billion, one hundred seventy-one million, forty-seven thousand, six hundred forty-nine".