1679561 has 4 divisors (see below), whose sum is σ = 1808772. Its totient is φ = 1550352.

The previous prime is 1679539. The next prime is 1679599. The reversal of 1679561 is 1659761.

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

It can be written as a sum of positive squares in 2 ways, for example, as 765625 + 913936 = 875^2 + 956^2 .

It is a cyclic number.

It is not a de Polignac number, because 1679561 - 2¹⁸ = 1417417 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1679501) 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, 64586 + ... + 64611.

It is an arithmetic number, because the mean of its divisors is an integer number (452193).

2^1679561 is an apocalyptic number.

It is an amenable number.

1679561 is a deficient number, since it is larger than the sum of its proper divisors (129211).

1679561 is a wasteful number, since it uses less digits than its factorization.

1679561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129210.

The product of its digits is 11340, while the sum is 35.

The square root of 1679561 is about 1295.9787806905. The cubic root of 1679561 is about 118.8680834638.

The spelling of 1679561 in words is "one million, six hundred seventy-nine thousand, five hundred sixty-one".