491945945 has 16 divisors (see below), whose sum is σ = 603998208. Its totient is φ = 384479040.

The previous prime is 491945941. The next prime is 491945963. The reversal of 491945945 is 549549194.

It is not a de Polignac number, because 491945945 - 2² = 491945941 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 491945893 and 491945902.

It is not an unprimeable number, because it can be changed into a prime (491945941) 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 15 ways as a sum of consecutive naturals, for example, 153752 + ... + 156918.

It is an arithmetic number, because the mean of its divisors is an integer number (37749888).

Almost surely, 2^491945945 is an apocalyptic number.

It is an amenable number.

491945945 is a deficient number, since it is larger than the sum of its proper divisors (112052263).

491945945 is a wasteful number, since it uses less digits than its factorization.

491945945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3880.

The product of its digits is 1166400, while the sum is 50.

The square root of 491945945 is about 22179.8544855461. The cubic root of 491945945 is about 789.4157646986.

The spelling of 491945945 in words is "four hundred ninety-one million, nine hundred forty-five thousand, nine hundred forty-five".