491978327 has 2 divisors, whose sum is σ = 491978328. Its totient is φ = 491978326.

The previous prime is 491978309. The next prime is 491978369. The reversal of 491978327 is 723879194.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 491978327 - 2²⁶ = 424869463 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (491978527) 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 as a sum of consecutive naturals, namely, 245989163 + 245989164.

It is an arithmetic number, because the mean of its divisors is an integer number (245989164).

Almost surely, 2^491978327 is an apocalyptic number.

491978327 is a deficient number, since it is larger than the sum of its proper divisors (1).

491978327 is an equidigital number, since it uses as much as digits as its factorization.

491978327 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 762048, while the sum is 50.

The square root of 491978327 is about 22180.5844602887. The cubic root of 491978327 is about 789.4330852333.

The spelling of 491978327 in words is "four hundred ninety-one million, nine hundred seventy-eight thousand, three hundred twenty-seven".