494810989 has 2 divisors, whose sum is σ = 494810990. Its totient is φ = 494810988.

The previous prime is 494810951. The next prime is 494811047. The reversal of 494810989 is 989018494.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 438064900 + 56746089 = 20930^2 + 7533^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-494810989 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (494810929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 247405494 + 247405495.

It is an arithmetic number, because the mean of its divisors is an integer number (247405495).

Almost surely, 2^494810989 is an apocalyptic number.

It is an amenable number.

494810989 is a deficient number, since it is larger than the sum of its proper divisors (1).

494810989 is an equidigital number, since it uses as much as digits as its factorization.

494810989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 746496, while the sum is 52.

The square root of 494810989 is about 22244.3473493829. The cubic root of 494810989 is about 790.9452920886.

The spelling of 494810989 in words is "four hundred ninety-four million, eight hundred ten thousand, nine hundred eighty-nine".