688031 has 2 divisors, whose sum is σ = 688032. Its totient is φ = 688030.

The previous prime is 688027. The next prime is 688063. The reversal of 688031 is 130886.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 688031 - 2² = 688027 is a prime.

It is a super-2 number, since 2×688031² = 946773313922, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (688531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 344015 + 344016.

It is an arithmetic number, because the mean of its divisors is an integer number (344016).

2⁶⁸⁸⁰³¹ is an apocalyptic number.

688031 is a deficient number, since it is larger than the sum of its proper divisors (1).

688031 is an equidigital number, since it uses as much as digits as its factorization.

688031 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1152, while the sum is 26.

The square root of 688031 is about 829.4763408320. The cubic root of 688031 is about 88.2814251413.

The spelling of 688031 in words is "six hundred eighty-eight thousand, thirty-one".