491718827 has 2 divisors, whose sum is σ = 491718828. Its totient is φ = 491718826.

The previous prime is 491718811. The next prime is 491718833. The reversal of 491718827 is 728817194.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 491718827 - 2⁴ = 491718811 is a prime.

It is not a weakly prime, because it can be changed into another prime (491711827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 245859413 + 245859414.

It is an arithmetic number, because the mean of its divisors is an integer number (245859414).

Almost surely, 2^491718827 is an apocalyptic number.

491718827 is a deficient number, since it is larger than the sum of its proper divisors (1).

491718827 is an equidigital number, since it uses as much as digits as its factorization.

491718827 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 225792, while the sum is 47.

The square root of 491718827 is about 22174.7339781112. The cubic root of 491718827 is about 789.2942621028.

The spelling of 491718827 in words is "four hundred ninety-one million, seven hundred eighteen thousand, eight hundred twenty-seven".