4491631706409 has 15 divisors (see below), whose sum is σ = 6709749931533. Its totient is φ = 2994408421524.

The previous prime is 4491631706267. The next prime is 4491631706411. The reversal of 4491631706409 is 9046071361944.

The square root of 4491631706409 is 2119347.

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

4491631706409 is a `hidden beast` number, since 4 + 4 + 9 + 1 + 63 + 170 + 6 + 409 = 666.

It is not a de Polignac number, because 4491631706409 - 2¹¹ = 4491631704361 is a prime.

It is not an unprimeable number, because it can be changed into a prime (4491631706609) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 18956382 + ... + 19191864.

Almost surely, 2^{4491631706409} is an apocalyptic number.

4491631706409 is the 2119347-th square number.

4491631706409 is the 1059674-th centered octagonal number.

It is an amenable number.

4491631706409 is a deficient number, since it is larger than the sum of its proper divisors (2218118225124).

4491631706409 is an frugal number, since it uses more digits than its factorization.

4491631706409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 470978 (or 235486 counting only the distinct ones).

The product of its (nonzero) digits is 3919104, while the sum is 54.

The spelling of 4491631706409 in words is "four trillion, four hundred ninety-one billion, six hundred thirty-one million, seven hundred six thousand, four hundred nine".