688159489 has 2 divisors, whose sum is σ = 688159490. Its totient is φ = 688159488.

The previous prime is 688159469. The next prime is 688159501. The reversal of 688159489 is 984951886.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 548730625 + 139428864 = 23425^2 + 11808^2 .

It is a cyclic number.

It is not a de Polignac number, because 688159489 - 2¹¹ = 688157441 is a prime.

It is a super-2 number, since 2×688159489² = 947126964601482242, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (688159469) 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, 344079744 + 344079745.

It is an arithmetic number, because the mean of its divisors is an integer number (344079745).

Almost surely, 2^688159489 is an apocalyptic number.

It is an amenable number.

688159489 is a deficient number, since it is larger than the sum of its proper divisors (1).

688159489 is an equidigital number, since it uses as much as digits as its factorization.

688159489 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4976640, while the sum is 58.

The square root of 688159489 is about 26232.7941515958. The cubic root of 688159489 is about 882.8692028417.

The spelling of 688159489 in words is "six hundred eighty-eight million, one hundred fifty-nine thousand, four hundred eighty-nine".