91230239 has 2 divisors, whose sum is σ = 91230240. Its totient is φ = 91230238.

The previous prime is 91230187. The next prime is 91230247. The reversal of 91230239 is 93203219.

It is a strong prime.

It is an emirp because it is prime and its reverse (93203219) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 91230239 - 2²⁴ = 74453023 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91230299) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45615119 + 45615120.

It is an arithmetic number, because the mean of its divisors is an integer number (45615120).

Almost surely, 2^91230239 is an apocalyptic number.

91230239 is a deficient number, since it is larger than the sum of its proper divisors (1).

91230239 is an equidigital number, since it uses as much as digits as its factorization.

91230239 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2916, while the sum is 29.

The square root of 91230239 is about 9551.4521932531. The cubic root of 91230239 is about 450.1731662765.

The spelling of 91230239 in words is "ninety-one million, two hundred thirty thousand, two hundred thirty-nine".