689653189 has 2 divisors, whose sum is σ = 689653190. Its totient is φ = 689653188.

The previous prime is 689653157. The next prime is 689653193. The reversal of 689653189 is 981356986.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 657922500 + 31730689 = 25650^2 + 5633^2 .

It is a cyclic number.

It is not a de Polignac number, because 689653189 - 2⁵ = 689653157 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 (689653109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 344826594 + 344826595.

It is an arithmetic number, because the mean of its divisors is an integer number (344826595).

Almost surely, 2^689653189 is an apocalyptic number.

It is an amenable number.

689653189 is a deficient number, since it is larger than the sum of its proper divisors (1).

689653189 is an equidigital number, since it uses as much as digits as its factorization.

689653189 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2799360, while the sum is 55.

The square root of 689653189 is about 26261.2488088438. The cubic root of 689653189 is about 883.5075184051.

The spelling of 689653189 in words is "six hundred eighty-nine million, six hundred fifty-three thousand, one hundred eighty-nine".