688371317 has 2 divisors, whose sum is σ = 688371318. Its totient is φ = 688371316.

The previous prime is 688371251. The next prime is 688371323. The reversal of 688371317 is 713173886.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 493461796 + 194909521 = 22214^2 + 13961^2 .

It is a cyclic number.

It is not a de Polignac number, because 688371317 - 2¹² = 688367221 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (688371377) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 344185658 + 344185659.

It is an arithmetic number, because the mean of its divisors is an integer number (344185659).

Almost surely, 2^688371317 is an apocalyptic number.

It is an amenable number.

688371317 is a deficient number, since it is larger than the sum of its proper divisors (1).

688371317 is an equidigital number, since it uses as much as digits as its factorization.

688371317 is an evil number, because the sum of its binary digits is even.

The product of its digits is 169344, while the sum is 44.

The square root of 688371317 is about 26236.8313063906. The cubic root of 688371317 is about 882.9597812783.

The spelling of 688371317 in words is "six hundred eighty-eight million, three hundred seventy-one thousand, three hundred seventeen".