687031 has 2 divisors, whose sum is σ = 687032. Its totient is φ = 687030.

The previous prime is 687023. The next prime is 687041. The reversal of 687031 is 130786.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 687031 - 2³ = 687023 is a prime.

It is a super-2 number, since 2×687031² = 944023189922, which contains 22 as substring.

It is a nialpdrome in base 15.

It is a junction number, because it is equal to n+sod(n) for n = 686987 and 687005.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (687041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 343515 + 343516.

It is an arithmetic number, because the mean of its divisors is an integer number (343516).

2⁶⁸⁷⁰³¹ is an apocalyptic number.

687031 is a deficient number, since it is larger than the sum of its proper divisors (1).

687031 is an equidigital number, since it uses as much as digits as its factorization.

687031 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1008, while the sum is 25.

The square root of 687031 is about 828.8733316979. The cubic root of 687031 is about 88.2386343224.

The spelling of 687031 in words is "six hundred eighty-seven thousand, thirty-one".