1679575981 has 2 divisors, whose sum is σ = 1679575982. Its totient is φ = 1679575980.

The previous prime is 1679575969. The next prime is 1679575987. The reversal of 1679575981 is 1895759761.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1275204100 + 404371881 = 35710^2 + 20109^2 .

It is a cyclic number.

It is not a de Polignac number, because 1679575981 - 2⁵ = 1679575949 is a prime.

It is a super-2 number, since 2×1679575981² = 5641950951904224722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1679575987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 839787990 + 839787991.

It is an arithmetic number, because the mean of its divisors is an integer number (839787991).

Almost surely, 2^1679575981 is an apocalyptic number.

It is an amenable number.

1679575981 is a deficient number, since it is larger than the sum of its proper divisors (1).

1679575981 is an equidigital number, since it uses as much as digits as its factorization.

1679575981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4762800, while the sum is 58.

The square root of 1679575981 is about 40982.6302352594. The cubic root of 1679575981 is about 1188.6843688102.

The spelling of 1679575981 in words is "one billion, six hundred seventy-nine million, five hundred seventy-five thousand, nine hundred eighty-one".