491179771 has 4 divisors (see below), whose sum is σ = 492729552. Its totient is φ = 489629992.

The previous prime is 491179763. The next prime is 491179781. The reversal of 491179771 is 177971194.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 491179771 - 2³ = 491179763 is a prime.

It is a super-2 number, since 2×491179771² = 482515134879224882, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (491179721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 774415 + ... + 775048.

It is an arithmetic number, because the mean of its divisors is an integer number (123182388).

Almost surely, 2^491179771 is an apocalyptic number.

491179771 is a deficient number, since it is larger than the sum of its proper divisors (1549781).

491179771 is a wasteful number, since it uses less digits than its factorization.

491179771 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1549780.

The product of its digits is 111132, while the sum is 46.

The square root of 491179771 is about 22162.5759107555. The cubic root of 491179771 is about 789.0057304210.

The spelling of 491179771 in words is "four hundred ninety-one million, one hundred seventy-nine thousand, seven hundred seventy-one".