7975728091 has 2 divisors, whose sum is σ = 7975728092. Its totient is φ = 7975728090.

The previous prime is 7975728083. The next prime is 7975728119. The reversal of 7975728091 is 1908275797.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 7975728091 - 2³ = 7975728083 is a prime.

It is a super-2 number, since 2×7975728091² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (7975728001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3987864045 + 3987864046.

It is an arithmetic number, because the mean of its divisors is an integer number (3987864046).

Almost surely, 2^7975728091 is an apocalyptic number.

7975728091 is a deficient number, since it is larger than the sum of its proper divisors (1).

7975728091 is an equidigital number, since it uses as much as digits as its factorization.

7975728091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2222640, while the sum is 55.

The square root of 7975728091 is about 89306.9319314016. The cubic root of 7975728091 is about 1997.9752918869.

The spelling of 7975728091 in words is "seven billion, nine hundred seventy-five million, seven hundred twenty-eight thousand, ninety-one".