17931084649 has 9 divisors (see below), whose sum is σ = 18029507223. Its totient is φ = 17833198632.

The previous prime is 17931084641. The next prime is 17931084653. The reversal of 17931084649 is 94648013971.

The square root of 17931084649 is 133907.

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., 9746625625 + 8184459024 = 98725^2 + 90468^2 .

It is not a de Polignac number, because 17931084649 - 2³ = 17931084641 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 17931084596 and 17931084605.

It is not an unprimeable number, because it can be changed into a prime (17931084641) 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, 48072427 + ... + 48072799.

Almost surely, 2^17931084649 is an apocalyptic number.

17931084649 is the 133907-th square number.

17931084649 is the 66954-th centered octagonal number.

It is an amenable number.

17931084649 is a deficient number, since it is larger than the sum of its proper divisors (98422574).

17931084649 is an frugal number, since it uses more digits than its factorization.

17931084649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1464 (or 732 counting only the distinct ones).

The product of its (nonzero) digits is 1306368, while the sum is 52.

The spelling of 17931084649 in words is "seventeen billion, nine hundred thirty-one million, eighty-four thousand, six hundred forty-nine".