685129097 has 2 divisors, whose sum is σ = 685129098. Its totient is φ = 685129096.

The previous prime is 685129091. The next prime is 685129153. The reversal of 685129097 is 790921586.

685129097 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., 473019001 + 212110096 = 21749^2 + 14564^2 .

It is a cyclic number.

It is not a de Polignac number, because 685129097 - 2¹⁴ = 685112713 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (685129091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 342564548 + 342564549.

It is an arithmetic number, because the mean of its divisors is an integer number (342564549).

Almost surely, 2^685129097 is an apocalyptic number.

It is an amenable number.

685129097 is a deficient number, since it is larger than the sum of its proper divisors (1).

685129097 is an equidigital number, since it uses as much as digits as its factorization.

685129097 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 272160, while the sum is 47.

The square root of 685129097 is about 26174.9708118271. The cubic root of 685129097 is about 881.5713561198.

The spelling of 685129097 in words is "six hundred eighty-five million, one hundred twenty-nine thousand, ninety-seven".