1679049649 has 4 divisors (see below), whose sum is σ = 1679592820. Its totient is φ = 1678506480.

The previous prime is 1679049637. The next prime is 1679049661. The reversal of 1679049649 is 9469409761.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (1679049637) and next prime (1679049661).

It can be written as a sum of positive squares in 2 ways, for example, as 190633249 + 1488416400 = 13807^2 + 38580^2 .

It is a cyclic number.

It is not a de Polignac number, because 1679049649 - 2¹⁵ = 1679016881 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 1679049649.

It is not an unprimeable number, because it can be changed into a prime (1679049689) 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, 266922 + ... + 273139.

It is an arithmetic number, because the mean of its divisors is an integer number (419898205).

Almost surely, 2^1679049649 is an apocalyptic number.

It is an amenable number.

1679049649 is a deficient number, since it is larger than the sum of its proper divisors (543171).

1679049649 is an equidigital number, since it uses as much as digits as its factorization.

1679049649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 543170.

The product of its (nonzero) digits is 2939328, while the sum is 55.

The square root of 1679049649 is about 40976.2083287363. The cubic root of 1679049649 is about 1188.5601890583.

The spelling of 1679049649 in words is "one billion, six hundred seventy-nine million, forty-nine thousand, six hundred forty-nine".