9691881439 has 2 divisors, whose sum is σ = 9691881440. Its totient is φ = 9691881438.

The previous prime is 9691881389. The next prime is 9691881469. The reversal of 9691881439 is 9341881969.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 9691881439 - 2⁹ = 9691880927 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9691881469) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4845940719 + 4845940720.

It is an arithmetic number, because the mean of its divisors is an integer number (4845940720).

Almost surely, 2^9691881439 is an apocalyptic number.

9691881439 is a deficient number, since it is larger than the sum of its proper divisors (1).

9691881439 is an equidigital number, since it uses as much as digits as its factorization.

9691881439 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3359232, while the sum is 58.

The square root of 9691881439 is about 98447.3536414260. The cubic root of 9691881439 is about 2132.0760790031.

The spelling of 9691881439 in words is "nine billion, six hundred ninety-one million, eight hundred eighty-one thousand, four hundred thirty-nine".