688687543 has 2 divisors, whose sum is σ = 688687544. Its totient is φ = 688687542.

The previous prime is 688687513. The next prime is 688687553. The reversal of 688687543 is 345786886.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 688687543 - 2²¹ = 686590391 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (688687513) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 344343771 + 344343772.

It is an arithmetic number, because the mean of its divisors is an integer number (344343772).

Almost surely, 2^688687543 is an apocalyptic number.

688687543 is a deficient number, since it is larger than the sum of its proper divisors (1).

688687543 is an equidigital number, since it uses as much as digits as its factorization.

688687543 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7741440, while the sum is 55.

The square root of 688687543 is about 26242.8569900459. The cubic root of 688687543 is about 883.0949661164.

The spelling of 688687543 in words is "six hundred eighty-eight million, six hundred eighty-seven thousand, five hundred forty-three".