91067993 has 2 divisors, whose sum is σ = 91067994. Its totient is φ = 91067992.

The previous prime is 91067983. The next prime is 91068013. The reversal of 91067993 is 39976019.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 83685904 + 7382089 = 9148^2 + 2717^2 .

It is a cyclic number.

It is not a de Polignac number, because 91067993 - 2²⁰ = 90019417 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (91067923) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45533996 + 45533997.

It is an arithmetic number, because the mean of its divisors is an integer number (45533997).

Almost surely, 2^91067993 is an apocalyptic number.

It is an amenable number.

91067993 is a deficient number, since it is larger than the sum of its proper divisors (1).

91067993 is an equidigital number, since it uses as much as digits as its factorization.

91067993 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 91854, while the sum is 44.

The square root of 91067993 is about 9542.9551502666. The cubic root of 91067993 is about 449.9061417418.

The spelling of 91067993 in words is "ninety-one million, sixty-seven thousand, nine hundred ninety-three".