91865593 has 2 divisors, whose sum is σ = 91865594. Its totient is φ = 91865592.

The previous prime is 91865539. The next prime is 91865621. The reversal of 91865593 is 39556819.

Together with previous prime (91865539) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 82937449 + 8928144 = 9107^2 + 2988^2 .

It is an emirp because it is prime and its reverse (39556819) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 91865593 - 2¹³ = 91857401 is a prime.

It is not a weakly prime, because it can be changed into another prime (91865993) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45932796 + 45932797.

It is an arithmetic number, because the mean of its divisors is an integer number (45932797).

Almost surely, 2^91865593 is an apocalyptic number.

It is an amenable number.

91865593 is a deficient number, since it is larger than the sum of its proper divisors (1).

91865593 is an equidigital number, since it uses as much as digits as its factorization.

91865593 is an evil number, because the sum of its binary digits is even.

The product of its digits is 291600, while the sum is 46.

The square root of 91865593 is about 9584.6540365315. The cubic root of 91865593 is about 451.2157953729.

The spelling of 91865593 in words is "ninety-one million, eight hundred sixty-five thousand, five hundred ninety-three".