491447699 has 2 divisors, whose sum is σ = 491447700. Its totient is φ = 491447698.

The previous prime is 491447669. The next prime is 491447701. The reversal of 491447699 is 996744194.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-491447699 is a prime.

It is a Sophie Germain prime.

Together with 491447701, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 491447699.

It is not a weakly prime, because it can be changed into another prime (491447669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 245723849 + 245723850.

It is an arithmetic number, because the mean of its divisors is an integer number (245723850).

Almost surely, 2^491447699 is an apocalyptic number.

491447699 is a deficient number, since it is larger than the sum of its proper divisors (1).

491447699 is an equidigital number, since it uses as much as digits as its factorization.

491447699 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1959552, while the sum is 53.

The square root of 491447699 is about 22168.6196909054. The cubic root of 491447699 is about 789.1491662287.

The spelling of 491447699 in words is "four hundred ninety-one million, four hundred forty-seven thousand, six hundred ninety-nine".