991068679 has 2 divisors, whose sum is σ = 991068680. Its totient is φ = 991068678.

The previous prime is 991068653. The next prime is 991068697. The reversal of 991068679 is 976860199.

Together with next prime (991068697) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 991068679 - 2⁹ = 991068167 is a prime.

It is a super-3 number, since 3×991068679³ (a number of 28 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (991068629) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 495534339 + 495534340.

It is an arithmetic number, because the mean of its divisors is an integer number (495534340).

Almost surely, 2^991068679 is an apocalyptic number.

991068679 is a deficient number, since it is larger than the sum of its proper divisors (1).

991068679 is an equidigital number, since it uses as much as digits as its factorization.

991068679 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1469664, while the sum is 55.

The square root of 991068679 is about 31481.2432886632. The cubic root of 991068679 is about 997.0139855927.

The spelling of 991068679 in words is "nine hundred ninety-one million, sixty-eight thousand, six hundred seventy-nine".