688511 has 2 divisors, whose sum is σ = 688512. Its totient is φ = 688510.

The previous prime is 688477. The next prime is 688531. The reversal of 688511 is 115886.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 688511 - 2⁶ = 688447 is a prime.

It is a Sophie Germain prime.

It is a zygodrome in base 4.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (688531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 344255 + 344256.

It is an arithmetic number, because the mean of its divisors is an integer number (344256).

2⁶⁸⁸⁵¹¹ is an apocalyptic number.

688511 is a deficient number, since it is larger than the sum of its proper divisors (1).

688511 is an equidigital number, since it uses as much as digits as its factorization.

688511 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1920, while the sum is 29.

The square root of 688511 is about 829.7656295605. The cubic root of 688511 is about 88.3019500080.

The spelling of 688511 in words is "six hundred eighty-eight thousand, five hundred eleven".