686804929 has 2 divisors, whose sum is σ = 686804930. Its totient is φ = 686804928.

The previous prime is 686804893. The next prime is 686804953. The reversal of 686804929 is 929408686.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 559227904 + 127577025 = 23648^2 + 11295^2 .

It is a cyclic number.

It is not a de Polignac number, because 686804929 - 2¹¹ = 686802881 is a prime.

It is not a weakly prime, because it can be changed into another prime (686807929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 343402464 + 343402465.

It is an arithmetic number, because the mean of its divisors is an integer number (343402465).

Almost surely, 2^686804929 is an apocalyptic number.

It is an amenable number.

686804929 is a deficient number, since it is larger than the sum of its proper divisors (1).

686804929 is an equidigital number, since it uses as much as digits as its factorization.

686804929 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1492992, while the sum is 52.

The square root of 686804929 is about 26206.9633685400. The cubic root of 686804929 is about 882.2895480536.

The spelling of 686804929 in words is "six hundred eighty-six million, eight hundred four thousand, nine hundred twenty-nine".