1979671081 has 2 divisors, whose sum is σ = 1979671082. Its totient is φ = 1979671080.

The previous prime is 1979671049. The next prime is 1979671103. The reversal of 1979671081 is 1801769791.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1108890000 + 870781081 = 33300^2 + 29509^2 .

It is a cyclic number.

It is not a de Polignac number, because 1979671081 - 2⁵ = 1979671049 is a prime.

It is a super-2 number, since 2×1979671081² = 7838195177895417122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1979671481) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 989835540 + 989835541.

It is an arithmetic number, because the mean of its divisors is an integer number (989835541).

Almost surely, 2^1979671081 is an apocalyptic number.

It is an amenable number.

1979671081 is a deficient number, since it is larger than the sum of its proper divisors (1).

1979671081 is an equidigital number, since it uses as much as digits as its factorization.

1979671081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 190512, while the sum is 49.

The square root of 1979671081 is about 44493.4948166583. The cubic root of 1979671081 is about 1255.6376988020.

The spelling of 1979671081 in words is "one billion, nine hundred seventy-nine million, six hundred seventy-one thousand, eighty-one".