689240213 has 2 divisors, whose sum is σ = 689240214. Its totient is φ = 689240212.

The previous prime is 689240203. The next prime is 689240269. The reversal of 689240213 is 312042986.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 671742724 + 17497489 = 25918^2 + 4183^2 .

It is a cyclic number.

It is not a de Polignac number, because 689240213 - 2²⁴ = 672462997 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 (689240203) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 344620106 + 344620107.

It is an arithmetic number, because the mean of its divisors is an integer number (344620107).

Almost surely, 2^689240213 is an apocalyptic number.

It is an amenable number.

689240213 is a deficient number, since it is larger than the sum of its proper divisors (1).

689240213 is an equidigital number, since it uses as much as digits as its factorization.

689240213 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20736, while the sum is 35.

The square root of 689240213 is about 26253.3847912988. The cubic root of 689240213 is about 883.3311301080.

The spelling of 689240213 in words is "six hundred eighty-nine million, two hundred forty thousand, two hundred thirteen".