494959991 has 2 divisors, whose sum is σ = 494959992. Its totient is φ = 494959990.

The previous prime is 494959973. The next prime is 494960029. The reversal of 494959991 is 199959494.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-494959991 is a prime.

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 494959991.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (494959901) 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, 247479995 + 247479996.

It is an arithmetic number, because the mean of its divisors is an integer number (247479996).

Almost surely, 2^494959991 is an apocalyptic number.

494959991 is a deficient number, since it is larger than the sum of its proper divisors (1).

494959991 is an equidigital number, since it uses as much as digits as its factorization.

494959991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4723920, while the sum is 59.

The square root of 494959991 is about 22247.6963077079. The cubic root of 494959991 is about 791.0246763420.

The spelling of 494959991 in words is "four hundred ninety-four million, nine hundred fifty-nine thousand, nine hundred ninety-one".