491532909 has 32 divisors (see below), whose sum is σ = 767840256. Its totient is φ = 273858240.

The previous prime is 491532893. The next prime is 491532949. The reversal of 491532909 is 909235194.

It is not a de Polignac number, because 491532909 - 2⁴ = 491532893 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (491532949) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 312094 + ... + 313664.

It is an arithmetic number, because the mean of its divisors is an integer number (23995008).

Almost surely, 2^491532909 is an apocalyptic number.

It is an amenable number.

491532909 is a deficient number, since it is larger than the sum of its proper divisors (276307347).

491532909 is a wasteful number, since it uses less digits than its factorization.

491532909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1945.

The product of its (nonzero) digits is 87480, while the sum is 42.

The square root of 491532909 is about 22170.5414683539. The cubic root of 491532909 is about 789.1947726514.

The spelling of 491532909 in words is "four hundred ninety-one million, five hundred thirty-two thousand, nine hundred nine".