491489 has 2 divisors, whose sum is σ = 491490.
Its totient is φ = 491488.
The previous prime is 491483. The next prime is 491497. The reversal of 491489 is 984194.
It is a weak prime.
It can be written as a sum of positive squares in only one way, i.e., 483025 + 8464 = 695^2 + 92^2
It is a cyclic number.
It is a de Polignac number, because none of the positive numbers 2k-491489 is a prime.
It is a super-2 number, since 2×4914892 = 483122874242, which contains 22 as substring.
It is not a weakly prime, because it can be changed into another prime (491483) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 245744 + 245745.
It is an arithmetic number, because the mean of its divisors is an integer number (245745).
2491489 is an apocalyptic number.
It is an amenable number.
491489 is a deficient number, since it is larger than the sum of its proper divisors (1).
491489 is an equidigital number, since it uses as much as digits as its factorization.
491489 is an evil number, because the sum of its binary digits is even.
The product of its digits is 10368, while the sum is 35.
The square root of 491489 is about 701.0627646652.
The cubic root of 491489 is about 78.9171272166.
The spelling of 491489 in words is "four hundred ninety-one thousand, four hundred eighty-nine".