491972347 has 4 divisors (see below), whose sum is σ = 492872296. Its totient is φ = 491072400.

The previous prime is 491972317. The next prime is 491972353. The reversal of 491972347 is 743279194.

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 491972347 - 2²³ = 483583739 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 491972297 and 491972306.

It is not an unprimeable number, because it can be changed into a prime (491972317) 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 3 ways as a sum of consecutive naturals, for example, 449154 + ... + 450247.

It is an arithmetic number, because the mean of its divisors is an integer number (123218074).

Almost surely, 2^491972347 is an apocalyptic number.

491972347 is a deficient number, since it is larger than the sum of its proper divisors (899949).

491972347 is an equidigital number, since it uses as much as digits as its factorization.

491972347 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 899948.

The product of its digits is 381024, while the sum is 46.

The square root of 491972347 is about 22180.4496572996. The cubic root of 491972347 is about 789.4298866988.

The spelling of 491972347 in words is "four hundred ninety-one million, nine hundred seventy-two thousand, three hundred forty-seven".