491027091 has 16 divisors (see below), whose sum is σ = 661006080. Its totient is φ = 324211680.

The previous prime is 491027071. The next prime is 491027093. The reversal of 491027091 is 190720194.

It is not a de Polignac number, because 491027091 - 2²¹ = 488929939 is a prime.

It is a super-2 number, since 2×491027091² = 482215208191844562, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (491027093) 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, 208581 + ... + 210921.

It is an arithmetic number, because the mean of its divisors is an integer number (41312880).

Almost surely, 2^491027091 is an apocalyptic number.

491027091 is a deficient number, since it is larger than the sum of its proper divisors (169978989).

491027091 is a wasteful number, since it uses less digits than its factorization.

491027091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2986.

The product of its (nonzero) digits is 4536, while the sum is 33.

The square root of 491027091 is about 22159.1310975859. The cubic root of 491027091 is about 788.9239695355.

The spelling of 491027091 in words is "four hundred ninety-one million, twenty-seven thousand, ninety-one".