491671907 has 2 divisors, whose sum is σ = 491671908. Its totient is φ = 491671906.

The previous prime is 491671891. The next prime is 491671913. The reversal of 491671907 is 709176194.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 491671907 - 2⁴ = 491671891 is a prime.

It is a Chen prime.

It is equal to p_25939862 and since 491671907 and 25939862 have the same sum of digits, it is a Honaker prime.

It is a weakly prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 245835953 + 245835954.

It is an arithmetic number, because the mean of its divisors is an integer number (245835954).

Almost surely, 2^491671907 is an apocalyptic number.

491671907 is a deficient number, since it is larger than the sum of its proper divisors (1).

491671907 is an equidigital number, since it uses as much as digits as its factorization.

491671907 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 95256, while the sum is 44.

The square root of 491671907 is about 22173.6759920407. The cubic root of 491671907 is about 789.2691563834.

The spelling of 491671907 in words is "four hundred ninety-one million, six hundred seventy-one thousand, nine hundred seven".