688136983 has 2 divisors, whose sum is σ = 688136984. Its totient is φ = 688136982.

The previous prime is 688136971. The next prime is 688136987. The reversal of 688136983 is 389631886.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-688136983 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 688136983.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (688136987) 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, 344068491 + 344068492.

It is an arithmetic number, because the mean of its divisors is an integer number (344068492).

Almost surely, 2^688136983 is an apocalyptic number.

688136983 is a deficient number, since it is larger than the sum of its proper divisors (1).

688136983 is an equidigital number, since it uses as much as digits as its factorization.

688136983 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1492992, while the sum is 52.

The square root of 688136983 is about 26232.3651812032. The cubic root of 688136983 is about 882.8595781006.

The spelling of 688136983 in words is "six hundred eighty-eight million, one hundred thirty-six thousand, nine hundred eighty-three".