491592009 has 16 divisors (see below), whose sum is σ = 710942400. Its totient is φ = 300925440.

The previous prime is 491591939. The next prime is 491592029. The reversal of 491592009 is 900295194.

It is not a de Polignac number, because 491592009 - 2¹³ = 491583817 is a prime.

It is not an unprimeable number, because it can be changed into a prime (491592029) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 115459 + ... + 119640.

It is an arithmetic number, because the mean of its divisors is an integer number (44433900).

Almost surely, 2^491592009 is an apocalyptic number.

It is an amenable number.

491592009 is a deficient number, since it is larger than the sum of its proper divisors (219350391).

491592009 is a wasteful number, since it uses less digits than its factorization.

491592009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 235160.

The product of its (nonzero) digits is 29160, while the sum is 39.

The square root of 491592009 is about 22171.8742780127. The cubic root of 491592009 is about 789.2264012843.

The spelling of 491592009 in words is "four hundred ninety-one million, five hundred ninety-two thousand, nine".