91665803 has 2 divisors, whose sum is σ = 91665804. Its totient is φ = 91665802.

The previous prime is 91665797. The next prime is 91665811. The reversal of 91665803 is 30856619.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 91665803 - 2¹² = 91661707 is a prime.

It is not a weakly prime, because it can be changed into another prime (91665103) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45832901 + 45832902.

It is an arithmetic number, because the mean of its divisors is an integer number (45832902).

Almost surely, 2^91665803 is an apocalyptic number.

91665803 is a deficient number, since it is larger than the sum of its proper divisors (1).

91665803 is an equidigital number, since it uses as much as digits as its factorization.

91665803 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 38880, while the sum is 38.

The square root of 91665803 is about 9574.2259739365. The cubic root of 91665803 is about 450.8884554273. Note that the first 3 decimals are identical.

The spelling of 91665803 in words is "ninety-one million, six hundred sixty-five thousand, eight hundred three".