689655271 has 2 divisors, whose sum is σ = 689655272. Its totient is φ = 689655270.

The previous prime is 689655257. The next prime is 689655277. The reversal of 689655271 is 172556986.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-689655271 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 (689655277) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 344827635 + 344827636.

It is an arithmetic number, because the mean of its divisors is an integer number (344827636).

Almost surely, 2^689655271 is an apocalyptic number.

689655271 is a deficient number, since it is larger than the sum of its proper divisors (1).

689655271 is an equidigital number, since it uses as much as digits as its factorization.

689655271 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 907200, while the sum is 49.

The square root of 689655271 is about 26261.2884489699. The cubic root of 689655271 is about 883.5084074804.

The spelling of 689655271 in words is "six hundred eighty-nine million, six hundred fifty-five thousand, two hundred seventy-one".