491311641 has 8 divisors (see below), whose sum is σ = 672787264. Its totient is φ = 318688560.

The previous prime is 491311637. The next prime is 491311657. The reversal of 491311641 is 146113194.

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

It is not a de Polignac number, because 491311641 - 2² = 491311637 is a prime.

It is a super-2 number, since 2×491311641² = 482774257164225762, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 491311599 and 491311608.

It is not an unprimeable number, because it can be changed into a prime (491311621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2213005 + ... + 2213226.

It is an arithmetic number, because the mean of its divisors is an integer number (84098408).

Almost surely, 2^491311641 is an apocalyptic number.

It is an amenable number.

491311641 is a deficient number, since it is larger than the sum of its proper divisors (181475623).

491311641 is a wasteful number, since it uses less digits than its factorization.

491311641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4426271.

The product of its digits is 2592, while the sum is 30.

The square root of 491311641 is about 22165.5507714110. The cubic root of 491311641 is about 789.0763338144.

The spelling of 491311641 in words is "four hundred ninety-one million, three hundred eleven thousand, six hundred forty-one".