991268347 has 2 divisors, whose sum is σ = 991268348. Its totient is φ = 991268346.

The previous prime is 991268321. The next prime is 991268359. The reversal of 991268347 is 743862199.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 991268347 - 2⁷ = 991268219 is a prime.

It is a super-2 number, since 2×991268347² = 1965225871528224818, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 991268347.

It is not a weakly prime, because it can be changed into another prime (991268947) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 495634173 + 495634174.

It is an arithmetic number, because the mean of its divisors is an integer number (495634174).

Almost surely, 2^991268347 is an apocalyptic number.

991268347 is a deficient number, since it is larger than the sum of its proper divisors (1).

991268347 is an equidigital number, since it uses as much as digits as its factorization.

991268347 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 653184, while the sum is 49.

The square root of 991268347 is about 31484.4143505958. The cubic root of 991268347 is about 997.0809363585.

The spelling of 991268347 in words is "nine hundred ninety-one million, two hundred sixty-eight thousand, three hundred forty-seven".