1679617909 has 4 divisors (see below), whose sum is σ = 1688058400. Its totient is φ = 1671177420.

The previous prime is 1679617873. The next prime is 1679617921. The reversal of 1679617909 is 9097169761.

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.

It is a cyclic number.

It is not a de Polignac number, because 1679617909 - 2¹³ = 1679609717 is a prime.

It is a super-2 number, since 2×1679617909² = 5642232640467064562, which contains 22 as substring.

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 1679617909.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1679617939) 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, 4219947 + ... + 4220344.

It is an arithmetic number, because the mean of its divisors is an integer number (422014600).

Almost surely, 2^1679617909 is an apocalyptic number.

It is an amenable number.

1679617909 is a deficient number, since it is larger than the sum of its proper divisors (8440491).

1679617909 is an equidigital number, since it uses as much as digits as its factorization.

1679617909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8440490.

The product of its (nonzero) digits is 1285956, while the sum is 55.

The square root of 1679617909 is about 40983.1417658529. The cubic root of 1679617909 is about 1188.6942599462.

The spelling of 1679617909 in words is "one billion, six hundred seventy-nine million, six hundred seventeen thousand, nine hundred nine".