689458019 has 2 divisors, whose sum is σ = 689458020. Its totient is φ = 689458018.

The previous prime is 689457983. The next prime is 689458057. The reversal of 689458019 is 910854986.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 689458019 - 2¹² = 689453923 is a prime.

It is a super-2 number, since 2×689458019² = 950704719926808722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (689458519) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 344729009 + 344729010.

It is an arithmetic number, because the mean of its divisors is an integer number (344729010).

Almost surely, 2^689458019 is an apocalyptic number.

689458019 is a deficient number, since it is larger than the sum of its proper divisors (1).

689458019 is an equidigital number, since it uses as much as digits as its factorization.

689458019 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 622080, while the sum is 50.

The square root of 689458019 is about 26257.5326144708. The cubic root of 689458019 is about 883.4241671237.

The spelling of 689458019 in words is "six hundred eighty-nine million, four hundred fifty-eight thousand, nineteen".