3880991861 has 2 divisors, whose sum is σ = 3880991862. Its totient is φ = 3880991860.

The previous prime is 3880991843. The next prime is 3880991887. The reversal of 3880991861 is 1681990883.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2448369361 + 1432622500 = 49481^2 + 37850^2 .

It is a cyclic number.

It is not a de Polignac number, because 3880991861 - 2⁶ = 3880991797 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3880931861) 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, 1940495930 + 1940495931.

It is an arithmetic number, because the mean of its divisors is an integer number (1940495931).

Almost surely, 2^3880991861 is an apocalyptic number.

It is an amenable number.

3880991861 is a deficient number, since it is larger than the sum of its proper divisors (1).

3880991861 is an equidigital number, since it uses as much as digits as its factorization.

3880991861 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 746496, while the sum is 53.

The square root of 3880991861 is about 62297.6071851881. The cubic root of 3880991861 is about 1571.4994884654.

The spelling of 3880991861 in words is "three billion, eight hundred eighty million, nine hundred ninety-one thousand, eight hundred sixty-one".