491030905 has 16 divisors (see below), whose sum is σ = 598276224. Its totient is φ = 386830080.

The previous prime is 491030893. The next prime is 491030951. The reversal of 491030905 is 509030194.

It is not a de Polignac number, because 491030905 - 2²³ = 482642297 is a prime.

It is a super-2 number, since 2×491030905² = 482222699330238050, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 138100 + ... + 141610.

It is an arithmetic number, because the mean of its divisors is an integer number (37392264).

Almost surely, 2^491030905 is an apocalyptic number.

It is an amenable number.

491030905 is a deficient number, since it is larger than the sum of its proper divisors (107245319).

491030905 is a wasteful number, since it uses less digits than its factorization.

491030905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3936.

The product of its (nonzero) digits is 4860, while the sum is 31.

The square root of 491030905 is about 22159.2171567499. The cubic root of 491030905 is about 788.9260121575.

The spelling of 491030905 in words is "four hundred ninety-one million, thirty thousand, nine hundred five".