1685080979 has 4 divisors (see below), whose sum is σ = 1685306784. Its totient is φ = 1684855176.

The previous prime is 1685080963. The next prime is 1685081003. The reversal of 1685080979 is 9790805861.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9790805861 = 827 ⋅11838943.

It is a cyclic number.

It is not a de Polignac number, because 1685080979 - 2⁴ = 1685080963 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1685080979.

It is not an unprimeable number, because it can be changed into a prime (1685080079) 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, 101312 + ... + 116765.

It is an arithmetic number, because the mean of its divisors is an integer number (421326696).

Almost surely, 2^1685080979 is an apocalyptic number.

1685080979 is a deficient number, since it is larger than the sum of its proper divisors (225805).

1685080979 is an equidigital number, since it uses as much as digits as its factorization.

1685080979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 225804.

The product of its (nonzero) digits is 1088640, while the sum is 53.

The square root of 1685080979 is about 41049.7378676162. The cubic root of 1685080979 is about 1189.9816344881.

The spelling of 1685080979 in words is "one billion, six hundred eighty-five million, eighty thousand, nine hundred seventy-nine".