491999359 has 2 divisors, whose sum is σ = 491999360. Its totient is φ = 491999358.

The previous prime is 491999353. The next prime is 491999369. The reversal of 491999359 is 953999194.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 491999359 - 2³ = 491999351 is a prime.

It is a congruent number.

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

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 245999679 + 245999680.

It is an arithmetic number, because the mean of its divisors is an integer number (245999680).

Almost surely, 2^491999359 is an apocalyptic number.

491999359 is a deficient number, since it is larger than the sum of its proper divisors (1).

491999359 is an equidigital number, since it uses as much as digits as its factorization.

491999359 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3542940, while the sum is 58.

The square root of 491999359 is about 22181.0585635582. The cubic root of 491999359 is about 789.4443344552. Note that the first 3 decimals are identical.

The spelling of 491999359 in words is "four hundred ninety-one million, nine hundred ninety-nine thousand, three hundred fifty-nine".