688321097 has 2 divisors, whose sum is σ = 688321098. Its totient is φ = 688321096.

The previous prime is 688321057. The next prime is 688321129. The reversal of 688321097 is 790123886.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 687278656 + 1042441 = 26216^2 + 1021^2 .

It is a cyclic number.

It is not a de Polignac number, because 688321097 - 2¹⁴ = 688304713 is a prime.

It is a super-3 number, since 3×688321097³ (a number of 27 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (688321057) 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, 344160548 + 344160549.

It is an arithmetic number, because the mean of its divisors is an integer number (344160549).

Almost surely, 2^688321097 is an apocalyptic number.

It is an amenable number.

688321097 is a deficient number, since it is larger than the sum of its proper divisors (1).

688321097 is an equidigital number, since it uses as much as digits as its factorization.

688321097 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 145152, while the sum is 44.

The square root of 688321097 is about 26235.8742373872. The cubic root of 688321097 is about 882.9383087011.

The spelling of 688321097 in words is "six hundred eighty-eight million, three hundred twenty-one thousand, ninety-seven".