9991254047 has 2 divisors, whose sum is σ = 9991254048. Its totient is φ = 9991254046.

The previous prime is 9991254037. The next prime is 9991254067. The reversal of 9991254047 is 7404521999.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 9991254047 - 2⁸ = 9991253791 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 9991253986 and 9991254004.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9991254037) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4995627023 + 4995627024.

It is an arithmetic number, because the mean of its divisors is an integer number (4995627024).

Almost surely, 2^9991254047 is an apocalyptic number.

9991254047 is a deficient number, since it is larger than the sum of its proper divisors (1).

9991254047 is an equidigital number, since it uses as much as digits as its factorization.

9991254047 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 816480, while the sum is 50.

The square root of 9991254047 is about 99956.2606693548. The cubic root of 9991254047 is about 2153.8064206844.

The spelling of 9991254047 in words is "nine billion, nine hundred ninety-one million, two hundred fifty-four thousand, forty-seven".