1679639681 has 8 divisors (see below), whose sum is σ = 1697885280. Its totient is φ = 1661413248.

The previous prime is 1679639677. The next prime is 1679639711. The reversal of 1679639681 is 1869369761.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1679639681 - 2² = 1679639677 is a prime.

It is a super-2 number, since 2×1679639681² = 5642378915979563522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1679639651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 235790 + ... + 242808.

It is an arithmetic number, because the mean of its divisors is an integer number (212235660).

Almost surely, 2^1679639681 is an apocalyptic number.

It is an amenable number.

1679639681 is a deficient number, since it is larger than the sum of its proper divisors (18245599).

1679639681 is an equidigital number, since it uses as much as digits as its factorization.

1679639681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9583.

The product of its digits is 2939328, while the sum is 56.

The square root of 1679639681 is about 40983.4073864046. The cubic root of 1679639681 is about 1188.6993960627.

The spelling of 1679639681 in words is "one billion, six hundred seventy-nine million, six hundred thirty-nine thousand, six hundred eighty-one".