689779229 has 2 divisors, whose sum is σ = 689779230. Its totient is φ = 689779228.

The previous prime is 689779217. The next prime is 689779241. The reversal of 689779229 is 922977986.

It is a balanced prime because it is at equal distance from previous prime (689779217) and next prime (689779241).

It can be written as a sum of positive squares in only one way, i.e., 669619129 + 20160100 = 25877^2 + 4490^2 .

It is a cyclic number.

It is not a de Polignac number, because 689779229 - 2⁴ = 689779213 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (689779289) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 344889614 + 344889615.

It is an arithmetic number, because the mean of its divisors is an integer number (344889615).

Almost surely, 2^689779229 is an apocalyptic number.

It is an amenable number.

689779229 is a deficient number, since it is larger than the sum of its proper divisors (1).

689779229 is an equidigital number, since it uses as much as digits as its factorization.

689779229 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6858432, while the sum is 59.

The square root of 689779229 is about 26263.6484327673. The cubic root of 689779229 is about 883.5613379704.

The spelling of 689779229 in words is "six hundred eighty-nine million, seven hundred seventy-nine thousand, two hundred twenty-nine".