91067897 has 4 divisors (see below), whose sum is σ = 91133940. Its totient is φ = 91001856.

The previous prime is 91067887. The next prime is 91067909. The reversal of 91067897 is 79876019.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 79876019 = 19 ⋅4204001.

It can be written as a sum of positive squares in 2 ways, for example, as 18800896 + 72267001 = 4336^2 + 8501^2 .

It is a cyclic number.

It is not a de Polignac number, because 91067897 - 2¹² = 91063801 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91067887) 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 in 3 ways as a sum of consecutive naturals, for example, 30908 + ... + 33725.

It is an arithmetic number, because the mean of its divisors is an integer number (22783485).

Almost surely, 2^91067897 is an apocalyptic number.

It is an amenable number.

91067897 is a deficient number, since it is larger than the sum of its proper divisors (66043).

91067897 is a wasteful number, since it uses less digits than its factorization.

91067897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66042.

The product of its (nonzero) digits is 190512, while the sum is 47.

The square root of 91067897 is about 9542.9501203768. The cubic root of 91067897 is about 449.9059836512.

The spelling of 91067897 in words is "ninety-one million, sixty-seven thousand, eight hundred ninety-seven".