1685122289 has 4 divisors (see below), whose sum is σ = 1694536560. Its totient is φ = 1675708020.

The previous prime is 1685122277. The next prime is 1685122321. The reversal of 1685122289 is 9822215861.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 9822215861 = 42577 ⋅230693.

It is a cyclic number.

It is not a de Polignac number, because 1685122289 - 2¹⁶ = 1685056753 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1685122259) 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, 4706867 + ... + 4707224.

It is an arithmetic number, because the mean of its divisors is an integer number (423634140).

Almost surely, 2^1685122289 is an apocalyptic number.

It is an amenable number.

1685122289 is a deficient number, since it is larger than the sum of its proper divisors (9414271).

1685122289 is an equidigital number, since it uses as much as digits as its factorization.

1685122289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9414270.

The product of its digits is 138240, while the sum is 44.

The square root of 1685122289 is about 41050.2410346151. The cubic root of 1685122289 is about 1189.9913585984.

The spelling of 1685122289 in words is "one billion, six hundred eighty-five million, one hundred twenty-two thousand, two hundred eighty-nine".