91666667 has 2 divisors, whose sum is σ = 91666668. Its totient is φ = 91666666.

The previous prime is 91666633. The next prime is 91666727. The reversal of 91666667 is 76666619.

It is a weak prime.

It is an emirp because it is prime and its reverse (76666619) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 91666667 - 2¹⁰ = 91665643 is a prime.

It is not a weakly prime, because it can be changed into another prime (91666607) 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, 45833333 + 45833334.

It is an arithmetic number, because the mean of its divisors is an integer number (45833334).

Almost surely, 2^91666667 is an apocalyptic number.

91666667 is a deficient number, since it is larger than the sum of its proper divisors (1).

91666667 is an equidigital number, since it uses as much as digits as its factorization.

91666667 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 489888, while the sum is 47.

The square root of 91666667 is about 9574.2710949711. The cubic root of 91666667 is about 450.8898720457.

The spelling of 91666667 in words is "ninety-one million, six hundred sixty-six thousand, six hundred sixty-seven".