686431201 has 2 divisors, whose sum is σ = 686431202. Its totient is φ = 686431200.

The previous prime is 686431199. The next prime is 686431217. The reversal of 686431201 is 102134686.

It is a happy number.

686431201 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 641862225 + 44568976 = 25335^2 + 6676^2 .

It is a cyclic number.

It is not a de Polignac number, because 686431201 - 2¹ = 686431199 is a prime.

Together with 686431199, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (686431261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 343215600 + 343215601.

It is an arithmetic number, because the mean of its divisors is an integer number (343215601).

Almost surely, 2^686431201 is an apocalyptic number.

It is an amenable number.

686431201 is a deficient number, since it is larger than the sum of its proper divisors (1).

686431201 is an equidigital number, since it uses as much as digits as its factorization.

686431201 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6912, while the sum is 31.

The square root of 686431201 is about 26199.8320796146. The cubic root of 686431201 is about 882.1294850714.

Adding to 686431201 its reverse (102134686), we get a palindrome (788565887).

The spelling of 686431201 in words is "six hundred eighty-six million, four hundred thirty-one thousand, two hundred one".