1679909609 has 4 divisors (see below), whose sum is σ = 1919896704. Its totient is φ = 1439922516.

The previous prime is 1679909597. The next prime is 1679909611. The reversal of 1679909609 is 9069099761.

It is a happy number.

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: 9069099761 = 1283 ⋅7068667.

It is a cyclic number.

It is not a de Polignac number, because 1679909609 - 2⁸ = 1679909353 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1679909639) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 119993537 + ... + 119993550.

It is an arithmetic number, because the mean of its divisors is an integer number (479974176).

Almost surely, 2^1679909609 is an apocalyptic number.

It is an amenable number.

1679909609 is a deficient number, since it is larger than the sum of its proper divisors (239987095).

1679909609 is an equidigital number, since it uses as much as digits as its factorization.

1679909609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 239987094.

The product of its (nonzero) digits is 1653372, while the sum is 56.

The square root of 1679909609 is about 40986.7003917124. The cubic root of 1679909609 is about 1188.7630696524.

The spelling of 1679909609 in words is "one billion, six hundred seventy-nine million, nine hundred nine thousand, six hundred nine".