1049491655809 has 9 divisors (see below), whose sum is σ = 1052111535363. Its totient is φ = 1046878291512.

The previous prime is 1049491655791. The next prime is 1049491655837. The reversal of 1049491655809 is 9085561949401.

The square root of 1049491655809 is 1024447.

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., 541732800625 + 507758855184 = 736025^2 + 712572^2 .

It is not a de Polignac number, because 1049491655809 - 2¹⁷ = 1049491524737 is a prime.

It is a super-3 number, since 3×1049491655809³ (a number of 37 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1049491655909) by changing a digit.

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 in 8 ways as a sum of consecutive naturals, for example, 511198027 + ... + 511200079.

It is an arithmetic number, because the mean of its divisors is an integer number (116901281707).

Almost surely, 2^{1049491655809} is an apocalyptic number.

1049491655809 is the 1024447-th square number.

1049491655809 is the 512224-th centered octagonal number.

It is an amenable number.

1049491655809 is a deficient number, since it is larger than the sum of its proper divisors (2619879554).

1049491655809 is an frugal number, since it uses more digits than its factorization.

1049491655809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5104 (or 2552 counting only the distinct ones).

The product of its (nonzero) digits is 13996800, while the sum is 61.

The spelling of 1049491655809 in words is "one trillion, forty-nine billion, four hundred ninety-one million, six hundred fifty-five thousand, eight hundred nine".