688975141 has 2 divisors, whose sum is σ = 688975142. Its totient is φ = 688975140.

The previous prime is 688975139. The next prime is 688975153. The reversal of 688975141 is 141579886.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 401842116 + 287133025 = 20046^2 + 16945^2 .

It is a cyclic number.

It is not a de Polignac number, because 688975141 - 2¹ = 688975139 is a prime.

Together with 688975139, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (688975181) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 344487570 + 344487571.

It is an arithmetic number, because the mean of its divisors is an integer number (344487571).

Almost surely, 2^688975141 is an apocalyptic number.

It is an amenable number.

688975141 is a deficient number, since it is larger than the sum of its proper divisors (1).

688975141 is an equidigital number, since it uses as much as digits as its factorization.

688975141 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 483840, while the sum is 49.

The square root of 688975141 is about 26248.3359663046. The cubic root of 688975141 is about 883.2178767179.

The spelling of 688975141 in words is "six hundred eighty-eight million, nine hundred seventy-five thousand, one hundred forty-one".