9428307991 has 2 divisors, whose sum is σ = 9428307992. Its totient is φ = 9428307990.

The previous prime is 9428307989. The next prime is 9428308031. The reversal of 9428307991 is 1997038249.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (1997038249) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 9428307991 - 2¹ = 9428307989 is a prime.

Together with 9428307989, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9428307961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4714153995 + 4714153996.

It is an arithmetic number, because the mean of its divisors is an integer number (4714153996).

Almost surely, 2^9428307991 is an apocalyptic number.

9428307991 is a deficient number, since it is larger than the sum of its proper divisors (1).

9428307991 is an equidigital number, since it uses as much as digits as its factorization.

9428307991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 979776, while the sum is 52.

The square root of 9428307991 is about 97099.4747205154. The cubic root of 9428307991 is about 2112.5707076038.

The spelling of 9428307991 in words is "nine billion, four hundred twenty-eight million, three hundred seven thousand, nine hundred ninety-one".