491701971 has 8 divisors (see below), whose sum is σ = 671593104. Its totient is φ = 319806080.

The previous prime is 491701957. The next prime is 491701979. The reversal of 491701971 is 179107194.

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 491701971 - 2⁹ = 491701459 is a prime.

It is not an unprimeable number, because it can be changed into a prime (491701979) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1998666 + ... + 1998911.

It is an arithmetic number, because the mean of its divisors is an integer number (83949138).

Almost surely, 2^491701971 is an apocalyptic number.

491701971 is a gapful number since it is divisible by the number (41) formed by its first and last digit.

491701971 is a deficient number, since it is larger than the sum of its proper divisors (179891133).

491701971 is a wasteful number, since it uses less digits than its factorization.

491701971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3997621.

The product of its (nonzero) digits is 15876, while the sum is 39.

The square root of 491701971 is about 22174.3539026507. The cubic root of 491701971 is about 789.2852430623.

The spelling of 491701971 in words is "four hundred ninety-one million, seven hundred one thousand, nine hundred seventy-one".