491945947 has 4 divisors (see below), whose sum is σ = 501228000. Its totient is φ = 482663896.

The previous prime is 491945941. The next prime is 491945963. The reversal of 491945947 is 749549194.

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 491945947 - 2¹⁵ = 491913179 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 491945894 and 491945903.

It is not an unprimeable number, because it can be changed into a prime (491945941) 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, 4640947 + ... + 4641052.

It is an arithmetic number, because the mean of its divisors is an integer number (125307000).

Almost surely, 2^491945947 is an apocalyptic number.

491945947 is a deficient number, since it is larger than the sum of its proper divisors (9282053).

491945947 is an equidigital number, since it uses as much as digits as its factorization.

491945947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9282052.

The product of its digits is 1632960, while the sum is 52.

The square root of 491945947 is about 22179.8545306321. The cubic root of 491945947 is about 789.4157657684.

The spelling of 491945947 in words is "four hundred ninety-one million, nine hundred forty-five thousand, nine hundred forty-seven".