491219171 has 4 divisors (see below), whose sum is σ = 491524200. Its totient is φ = 490914144.

The previous prime is 491219159. The next prime is 491219203. The reversal of 491219171 is 171912194.

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 491219171 - 2⁶ = 491219107 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (491219111) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 150086 + ... + 153323.

It is an arithmetic number, because the mean of its divisors is an integer number (122881050).

Almost surely, 2^491219171 is an apocalyptic number.

491219171 is a deficient number, since it is larger than the sum of its proper divisors (305029).

491219171 is a wasteful number, since it uses less digits than its factorization.

491219171 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 305028.

The product of its digits is 4536, while the sum is 35.

The square root of 491219171 is about 22163.4647787750. The cubic root of 491219171 is about 789.0268265630.

The spelling of 491219171 in words is "four hundred ninety-one million, two hundred nineteen thousand, one hundred seventy-one".