791019908449 has 27 divisors (see below), whose sum is σ = 819359739723. Its totient is φ = 763654175232.

The previous prime is 791019908411. The next prime is 791019908477. The reversal of 791019908449 is 944809910197.

The square root of 791019908449 is 889393.

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

It can be written as a sum of positive squares in 13 ways, for example, as 12799528225 + 778220380224 = 113135^2 + 882168^2 .

It is not a de Polignac number, because 791019908449 - 2¹³ = 791019900257 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (791019908479) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 4572369327 + ... + 4572369499.

Almost surely, 2^791019908449 is an apocalyptic number.

791019908449 is the 889393-rd square number.

791019908449 is the 444697-th centered octagonal number.

It is an amenable number.

791019908449 is a deficient number, since it is larger than the sum of its proper divisors (28339831274).

791019908449 is an frugal number, since it uses more digits than its factorization.

791019908449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 646 (or 323 counting only the distinct ones).

The product of its (nonzero) digits is 5878656, while the sum is 61.

The spelling of 791019908449 in words is "seven hundred ninety-one billion, nineteen million, nine hundred eight thousand, four hundred forty-nine".