3872770861 has 2 divisors, whose sum is σ = 3872770862. Its totient is φ = 3872770860.

The previous prime is 3872770859. The next prime is 3872770903. The reversal of 3872770861 is 1680772783.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2063884900 + 1808885961 = 45430^2 + 42531^2 .

It is a cyclic number.

It is not a de Polignac number, because 3872770861 - 2¹ = 3872770859 is a prime.

Together with 3872770859, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3872770841) 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, 1936385430 + 1936385431.

It is an arithmetic number, because the mean of its divisors is an integer number (1936385431).

Almost surely, 2^3872770861 is an apocalyptic number.

It is an amenable number.

3872770861 is a deficient number, since it is larger than the sum of its proper divisors (1).

3872770861 is an equidigital number, since it uses as much as digits as its factorization.

3872770861 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 790272, while the sum is 49.

The square root of 3872770861 is about 62231.5905388895. The cubic root of 3872770861 is about 1570.3890824397.

The spelling of 3872770861 in words is "three billion, eight hundred seventy-two million, seven hundred seventy thousand, eight hundred sixty-one".