491194927609 has 9 divisors (see below), whose sum is σ = 518421997317. Its totient is φ = 465329947644.

The previous prime is 491194927603. The next prime is 491194927631. The reversal of 491194927609 is 906729491194.

The square root of 491194927609 is 700853.

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

It is not a de Polignac number, because 491194927609 - 2¹⁹ = 491194403321 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (491194927603) 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, 13297764 + ... + 13334650.

Almost surely, 2^491194927609 is an apocalyptic number.

491194927609 is the 700853-rd square number.

491194927609 is the 350427-th centered octagonal number.

It is an amenable number.

491194927609 is a deficient number, since it is larger than the sum of its proper divisors (27227069708).

491194927609 is an frugal number, since it uses more digits than its factorization.

491194927609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73812 (or 36906 counting only the distinct ones).

The product of its (nonzero) digits is 8817984, while the sum is 61.

The spelling of 491194927609 in words is "four hundred ninety-one billion, one hundred ninety-four million, nine hundred twenty-seven thousand, six hundred nine".