687061 has 2 divisors, whose sum is σ = 687062. Its totient is φ = 687060.

The previous prime is 687041. The next prime is 687073. The reversal of 687061 is 160786.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 600625 + 86436 = 775^2 + 294^2 .

It is a cyclic number.

It is not a de Polignac number, because 687061 - 2¹⁵ = 654293 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (687031) 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, 343530 + 343531.

It is an arithmetic number, because the mean of its divisors is an integer number (343531).

2⁶⁸⁷⁰⁶¹ is an apocalyptic number.

It is an amenable number.

687061 is a deficient number, since it is larger than the sum of its proper divisors (1).

687061 is an equidigital number, since it uses as much as digits as its factorization.

687061 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2016, while the sum is 28.

The square root of 687061 is about 828.8914283548. The cubic root of 687061 is about 88.2399186509.

It can be divided in two parts, 6870 and 61, that multiplied together give a triangular number (419070 = T₉₁₅).

The spelling of 687061 in words is "six hundred eighty-seven thousand, sixty-one".