685867037 has 2 divisors, whose sum is σ = 685867038. Its totient is φ = 685867036.

The previous prime is 685867027. The next prime is 685867069. The reversal of 685867037 is 730768586.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 426463801 + 259403236 = 20651^2 + 16106^2 .

It is a cyclic number.

It is not a de Polignac number, because 685867037 - 2¹⁴ = 685850653 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (685867027) 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, 342933518 + 342933519.

It is an arithmetic number, because the mean of its divisors is an integer number (342933519).

Almost surely, 2^685867037 is an apocalyptic number.

It is an amenable number.

685867037 is a deficient number, since it is larger than the sum of its proper divisors (1).

685867037 is an equidigital number, since it uses as much as digits as its factorization.

685867037 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1693440, while the sum is 50.

The square root of 685867037 is about 26189.0633089464. The cubic root of 685867037 is about 881.8877506723.

The spelling of 685867037 in words is "six hundred eighty-five million, eight hundred sixty-seven thousand, thirty-seven".