689140769 has 2 divisors, whose sum is σ = 689140770. Its totient is φ = 689140768.

The previous prime is 689140763. The next prime is 689140801. The reversal of 689140769 is 967041986.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 395532544 + 293608225 = 19888^2 + 17135^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-689140769 is a prime.

It is a super-2 number, since 2×689140769² = 949829998995822722, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (689140763) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 344570384 + 344570385.

It is an arithmetic number, because the mean of its divisors is an integer number (344570385).

Almost surely, 2^689140769 is an apocalyptic number.

It is an amenable number.

689140769 is a deficient number, since it is larger than the sum of its proper divisors (1).

689140769 is an equidigital number, since it uses as much as digits as its factorization.

689140769 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 653184, while the sum is 50.

The square root of 689140769 is about 26251.4907957624. The cubic root of 689140769 is about 883.2886455459.

The spelling of 689140769 in words is "six hundred eighty-nine million, one hundred forty thousand, seven hundred sixty-nine".