491567881 has 8 divisors (see below), whose sum is σ = 571314240. Its totient is φ = 414202128.

The previous prime is 491567821. The next prime is 491567897. The reversal of 491567881 is 188765194.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 491567881 - 2⁹ = 491567369 is a prime.

It is a super-2 number, since 2×491567881² = 483277963261660322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (491567821) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 594706 + ... + 595531.

It is an arithmetic number, because the mean of its divisors is an integer number (71414280).

Almost surely, 2^491567881 is an apocalyptic number.

It is an amenable number.

491567881 is a deficient number, since it is larger than the sum of its proper divisors (79746359).

491567881 is a wasteful number, since it uses less digits than its factorization.

491567881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1190303.

The product of its digits is 483840, while the sum is 49.

The square root of 491567881 is about 22171.3301585629. The cubic root of 491567881 is about 789.2134889737.

The spelling of 491567881 in words is "four hundred ninety-one million, five hundred sixty-seven thousand, eight hundred eighty-one".