1705985249 has 4 divisors (see below), whose sum is σ = 1706082564. Its totient is φ = 1705887936.

The previous prime is 1705985227. The next prime is 1705985261. The reversal of 1705985249 is 9425895071.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 9425895071 = 3089 ⋅3051439.

It can be written as a sum of positive squares in 2 ways, for example, as 168169024 + 1537816225 = 12968^2 + 39215^2 .

It is a cyclic number.

It is not a de Polignac number, because 1705985249 - 2¹⁶ = 1705919713 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1705985197 and 1705985206.

It is not an unprimeable number, because it can be changed into a prime (1705984249) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14252 + ... + 60125.

It is an arithmetic number, because the mean of its divisors is an integer number (426520641).

Almost surely, 2^1705985249 is an apocalyptic number.

It is an amenable number.

1705985249 is a deficient number, since it is larger than the sum of its proper divisors (97315).

1705985249 is an equidigital number, since it uses as much as digits as its factorization.

1705985249 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97314.

The product of its (nonzero) digits is 907200, while the sum is 50.

The square root of 1705985249 is about 41303.5742884317. The cubic root of 1705985249 is about 1194.8821972657.

The spelling of 1705985249 in words is "one billion, seven hundred five million, nine hundred eighty-five thousand, two hundred forty-nine".