9991254079 has 2 divisors, whose sum is σ = 9991254080. Its totient is φ = 9991254078.

The previous prime is 9991254067. The next prime is 9991254113. The reversal of 9991254079 is 9704521999.

9991254079 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 9991254079 - 2⁵ = 9991254047 is a prime.

It is a super-2 number, since 2×9991254079² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9991254979) 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, 4995627039 + 4995627040.

It is an arithmetic number, because the mean of its divisors is an integer number (4995627040).

Almost surely, 2^9991254079 is an apocalyptic number.

9991254079 is a deficient number, since it is larger than the sum of its proper divisors (1).

9991254079 is an equidigital number, since it uses as much as digits as its factorization.

9991254079 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1837080, while the sum is 55.

The square root of 9991254079 is about 99956.2608294248. The cubic root of 9991254079 is about 2153.8064229838.

The spelling of 9991254079 in words is "nine billion, nine hundred ninety-one million, two hundred fifty-four thousand, seventy-nine".