689941229 has 2 divisors, whose sum is σ = 689941230. Its totient is φ = 689941228.

The previous prime is 689941199. The next prime is 689941279. The reversal of 689941229 is 922149986.

It is a happy number.

It is an a-pointer prime, because the next prime (689941279) can be obtained adding 689941229 to its sum of digits (50).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 666156100 + 23785129 = 25810^2 + 4877^2 .

It is a cyclic number.

It is not a de Polignac number, because 689941229 - 2⁸ = 689940973 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (689941279) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 344970614 + 344970615.

It is an arithmetic number, because the mean of its divisors is an integer number (344970615).

Almost surely, 2^689941229 is an apocalyptic number.

It is an amenable number.

689941229 is a deficient number, since it is larger than the sum of its proper divisors (1).

689941229 is an equidigital number, since it uses as much as digits as its factorization.

689941229 is an evil number, because the sum of its binary digits is even.

The product of its digits is 559872, while the sum is 50.

The square root of 689941229 is about 26266.7323624390. The cubic root of 689941229 is about 883.6305029663.

The spelling of 689941229 in words is "six hundred eighty-nine million, nine hundred forty-one thousand, two hundred twenty-nine".