689904289 has 2 divisors, whose sum is σ = 689904290. Its totient is φ = 689904288.

The previous prime is 689904277. The next prime is 689904317. The reversal of 689904289 is 982409986.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 686859264 + 3045025 = 26208^2 + 1745^2 .

It is a cyclic number.

It is not a de Polignac number, because 689904289 - 2⁷ = 689904161 is a prime.

It is a Chen prime.

It is a plaindrome in base 14.

It is not a weakly prime, because it can be changed into another prime (689902289) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 344952144 + 344952145.

It is an arithmetic number, because the mean of its divisors is an integer number (344952145).

Almost surely, 2^689904289 is an apocalyptic number.

It is an amenable number.

689904289 is a deficient number, since it is larger than the sum of its proper divisors (1).

689904289 is an equidigital number, since it uses as much as digits as its factorization.

689904289 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2239488, while the sum is 55.

The square root of 689904289 is about 26266.0291821965. The cubic root of 689904289 is about 883.6147325924.

The spelling of 689904289 in words is "six hundred eighty-nine million, nine hundred four thousand, two hundred eighty-nine".