3881320991 has 2 divisors, whose sum is σ = 3881320992. Its totient is φ = 3881320990.

The previous prime is 3881320987. The next prime is 3881321009. The reversal of 3881320991 is 1990231883.

3881320991 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 3881320991 - 2² = 3881320987 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3881320951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1940660495 + 1940660496.

It is an arithmetic number, because the mean of its divisors is an integer number (1940660496).

Almost surely, 2^3881320991 is an apocalyptic number.

3881320991 is a deficient number, since it is larger than the sum of its proper divisors (1).

3881320991 is an equidigital number, since it uses as much as digits as its factorization.

3881320991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 93312, while the sum is 44.

The square root of 3881320991 is about 62300.2487234200. The cubic root of 3881320991 is about 1571.5439112165.

The spelling of 3881320991 in words is "three billion, eight hundred eighty-one million, three hundred twenty thousand, nine hundred ninety-one".