3968308991 has 2 divisors, whose sum is σ = 3968308992. Its totient is φ = 3968308990.

The previous prime is 3968308969. The next prime is 3968308999. The reversal of 3968308991 is 1998038693.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 3968308991 - 2³⁰ = 2894567167 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3968308999) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1984154495 + 1984154496.

It is an arithmetic number, because the mean of its divisors is an integer number (1984154496).

Almost surely, 2^3968308991 is an apocalyptic number.

3968308991 is a deficient number, since it is larger than the sum of its proper divisors (1).

3968308991 is an equidigital number, since it uses as much as digits as its factorization.

3968308991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2519424, while the sum is 56.

The square root of 3968308991 is about 62994.5155628647. The cubic root of 3968308991 is about 1583.1977366525.

The spelling of 3968308991 in words is "three billion, nine hundred sixty-eight million, three hundred eight thousand, nine hundred ninety-one".