1679180561 has 4 divisors (see below), whose sum is σ = 1679324724. Its totient is φ = 1679036400.

The previous prime is 1679180557. The next prime is 1679180567. The reversal of 1679180561 is 1650819761.

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 1416092161 + 263088400 = 37631^2 + 16220^2 .

It is a cyclic number.

It is not a de Polignac number, because 1679180561 - 2² = 1679180557 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1679180567) 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 3 ways as a sum of consecutive naturals, for example, 52910 + ... + 78471.

It is an arithmetic number, because the mean of its divisors is an integer number (419831181).

Almost surely, 2^1679180561 is an apocalyptic number.

It is an amenable number.

1679180561 is a deficient number, since it is larger than the sum of its proper divisors (144163).

1679180561 is a wasteful number, since it uses less digits than its factorization.

1679180561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 144162.

The product of its (nonzero) digits is 90720, while the sum is 44.

The square root of 1679180561 is about 40977.8057123609. The cubic root of 1679180561 is about 1188.5910781087.

The spelling of 1679180561 in words is "one billion, six hundred seventy-nine million, one hundred eighty thousand, five hundred sixty-one".