9991254067 has 2 divisors, whose sum is σ = 9991254068. Its totient is φ = 9991254066.

The previous prime is 9991254047. The next prime is 9991254079. The reversal of 9991254067 is 7604521999.

It is a strong prime.

It is an emirp because it is prime and its reverse (7604521999) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9991254067 is a prime.

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, 4995627033 + 4995627034.

It is an arithmetic number, because the mean of its divisors is an integer number (4995627034).

Almost surely, 2^9991254067 is an apocalyptic number.

9991254067 is a deficient number, since it is larger than the sum of its proper divisors (1).

9991254067 is an equidigital number, since it uses as much as digits as its factorization.

9991254067 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1224720, while the sum is 52.

The square root of 9991254067 is about 99956.2607693985. The cubic root of 9991254067 is about 2153.8064221216.

The spelling of 9991254067 in words is "nine billion, nine hundred ninety-one million, two hundred fifty-four thousand, sixty-seven".