688091039 has 2 divisors, whose sum is σ = 688091040. Its totient is φ = 688091038.

The previous prime is 688091021. The next prime is 688091051. The reversal of 688091039 is 930190886.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 688091039 - 2²⁸ = 419655583 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (688091009) 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, 344045519 + 344045520.

It is an arithmetic number, because the mean of its divisors is an integer number (344045520).

Almost surely, 2^688091039 is an apocalyptic number.

688091039 is a deficient number, since it is larger than the sum of its proper divisors (1).

688091039 is an equidigital number, since it uses as much as digits as its factorization.

688091039 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 93312, while the sum is 44.

The square root of 688091039 is about 26231.4894544706. The cubic root of 688091039 is about 882.8399293949.

The spelling of 688091039 in words is "six hundred eighty-eight million, ninety-one thousand, thirty-nine".