91865063 has 2 divisors, whose sum is σ = 91865064. Its totient is φ = 91865062.

The previous prime is 91865047. The next prime is 91865077. The reversal of 91865063 is 36056819.

It is a strong prime.

It is an emirp because it is prime and its reverse (36056819) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 91865063 - 2⁴ = 91865047 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91865023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45932531 + 45932532.

It is an arithmetic number, because the mean of its divisors is an integer number (45932532).

Almost surely, 2^91865063 is an apocalyptic number.

91865063 is a deficient number, since it is larger than the sum of its proper divisors (1).

91865063 is an equidigital number, since it uses as much as digits as its factorization.

91865063 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 91865063 is about 9584.6263881280. The cubic root of 91865063 is about 451.2149276384.

The spelling of 91865063 in words is "ninety-one million, eight hundred sixty-five thousand, sixty-three".