9438820691 has 2 divisors, whose sum is σ = 9438820692. Its totient is φ = 9438820690.

The previous prime is 9438820687. The next prime is 9438820693. The reversal of 9438820691 is 1960288349.

It is a happy number.

9438820691 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 9438820691 - 2² = 9438820687 is a prime.

Together with 9438820693, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (9438820693) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4719410345 + 4719410346.

It is an arithmetic number, because the mean of its divisors is an integer number (4719410346).

Almost surely, 2^9438820691 is an apocalyptic number.

9438820691 is a deficient number, since it is larger than the sum of its proper divisors (1).

9438820691 is an equidigital number, since it uses as much as digits as its factorization.

9438820691 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 50.

The square root of 9438820691 is about 97153.5932994761. The cubic root of 9438820691 is about 2113.3555982693.

The spelling of 9438820691 in words is "nine billion, four hundred thirty-eight million, eight hundred twenty thousand, six hundred ninety-one".