686960993 has 2 divisors, whose sum is σ = 686960994. Its totient is φ = 686960992.

The previous prime is 686960969. The next prime is 686960999. The reversal of 686960993 is 399069686.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 378185809 + 308775184 = 19447^2 + 17572^2 .

It is a cyclic number.

It is not a de Polignac number, because 686960993 - 2⁸ = 686960737 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (686960999) 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, 343480496 + 343480497.

It is an arithmetic number, because the mean of its divisors is an integer number (343480497).

Almost surely, 2^686960993 is an apocalyptic number.

It is an amenable number.

686960993 is a deficient number, since it is larger than the sum of its proper divisors (1).

686960993 is an equidigital number, since it uses as much as digits as its factorization.

686960993 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3779136, while the sum is 56.

The square root of 686960993 is about 26209.9407286625. The cubic root of 686960993 is about 882.3563711073.

The spelling of 686960993 in words is "six hundred eighty-six million, nine hundred sixty thousand, nine hundred ninety-three".