491064646 has 8 divisors (see below), whose sum is σ = 738966384. Its totient is φ = 244742520.

The previous prime is 491064643. The next prime is 491064647. The reversal of 491064646 is 646460194.

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

It is a super-2 number, since 2×491064646² = 482288973102210632, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 491064599 and 491064608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (491064643) 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 3 ways as a sum of consecutive naturals, for example, 394125 + ... + 395368.

It is an arithmetic number, because the mean of its divisors is an integer number (92370798).

Almost surely, 2^491064646 is an apocalyptic number.

491064646 is a deficient number, since it is larger than the sum of its proper divisors (247901738).

491064646 is a wasteful number, since it uses less digits than its factorization.

491064646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 789806.

The product of its (nonzero) digits is 124416, while the sum is 40.

The square root of 491064646 is about 22159.9784747188. The cubic root of 491064646 is about 788.9440819929.

The spelling of 491064646 in words is "four hundred ninety-one million, sixty-four thousand, six hundred forty-six".