1685296729 has 2 divisors, whose sum is σ = 1685296730. Its totient is φ = 1685296728.

The previous prime is 1685296693. The next prime is 1685296747. The reversal of 1685296729 is 9276925861.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1205686729 + 479610000 = 34723^2 + 21900^2 .

It is a cyclic number.

It is not a de Polignac number, because 1685296729 - 2²¹ = 1683199577 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1685296729.

It is not a weakly prime, because it can be changed into another prime (1685290729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 842648364 + 842648365.

It is an arithmetic number, because the mean of its divisors is an integer number (842648365).

Almost surely, 2^1685296729 is an apocalyptic number.

It is an amenable number.

1685296729 is a deficient number, since it is larger than the sum of its proper divisors (1).

1685296729 is an equidigital number, since it uses as much as digits as its factorization.

1685296729 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3265920, while the sum is 55.

The square root of 1685296729 is about 41052.3656930998. The cubic root of 1685296729 is about 1190.0324189083.

The spelling of 1685296729 in words is "one billion, six hundred eighty-five million, two hundred ninety-six thousand, seven hundred twenty-nine".