491999353 has 2 divisors, whose sum is σ = 491999354. Its totient is φ = 491999352.

The previous prime is 491999351. The next prime is 491999359. The reversal of 491999353 is 353999194.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 481056489 + 10942864 = 21933^2 + 3308^2 .

It is a cyclic number.

It is not a de Polignac number, because 491999353 - 2¹ = 491999351 is a prime.

Together with 491999351, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 491999353.

It is not a weakly prime, because it can be changed into another prime (491999351) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 245999676 + 245999677.

It is an arithmetic number, because the mean of its divisors is an integer number (245999677).

Almost surely, 2^491999353 is an apocalyptic number.

It is an amenable number.

491999353 is a deficient number, since it is larger than the sum of its proper divisors (1).

491999353 is an equidigital number, since it uses as much as digits as its factorization.

491999353 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1180980, while the sum is 52.

The square root of 491999353 is about 22181.0584283077. The cubic root of 491999353 is about 789.4443312460. Note that the first 3 decimals are identical.

The spelling of 491999353 in words is "four hundred ninety-one million, nine hundred ninety-nine thousand, three hundred fifty-three".