687901 has 2 divisors, whose sum is σ = 687902. Its totient is φ = 687900.

The previous prime is 687893. The next prime is 687917. The reversal of 687901 is 109786.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 682276 + 5625 = 826^2 + 75^2 .

It is a cyclic number.

It is not a de Polignac number, because 687901 - 2³ = 687893 is a prime.

It is an Ulam number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (687931) 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, 343950 + 343951.

It is an arithmetic number, because the mean of its divisors is an integer number (343951).

2⁶⁸⁷⁹⁰¹ is an apocalyptic number.

It is an amenable number.

687901 is a deficient number, since it is larger than the sum of its proper divisors (1).

687901 is an equidigital number, since it uses as much as digits as its factorization.

687901 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3024, while the sum is 31.

The square root of 687901 is about 829.3979744369. The cubic root of 687901 is about 88.2758646805.

The spelling of 687901 in words is "six hundred eighty-seven thousand, nine hundred one".