991408948307 has 2 divisors, whose sum is σ = 991408948308. Its totient is φ = 991408948306.

The previous prime is 991408948273. The next prime is 991408948339. The reversal of 991408948307 is 703849804199.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 991408948307 - 2²⁸ = 991140512851 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 991408948307.

It is not a weakly prime, because it can be changed into another prime (991408938307) 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, 495704474153 + 495704474154.

It is an arithmetic number, because the mean of its divisors is an integer number (495704474154).

Almost surely, 2^991408948307 is an apocalyptic number.

991408948307 is a deficient number, since it is larger than the sum of its proper divisors (1).

991408948307 is an equidigital number, since it uses as much as digits as its factorization.

991408948307 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15676416, while the sum is 62.

The spelling of 991408948307 in words is "nine hundred ninety-one billion, four hundred eight million, nine hundred forty-eight thousand, three hundred seven".