91443251 has 2 divisors, whose sum is σ = 91443252. Its totient is φ = 91443250.

The previous prime is 91443229. The next prime is 91443269. The reversal of 91443251 is 15234419.

It is a strong prime.

It is an emirp because it is prime and its reverse (15234419) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 91443251 - 2¹⁸ = 91181107 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (91443271) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45721625 + 45721626.

It is an arithmetic number, because the mean of its divisors is an integer number (45721626).

Almost surely, 2^91443251 is an apocalyptic number.

91443251 is a deficient number, since it is larger than the sum of its proper divisors (1).

91443251 is an equidigital number, since it uses as much as digits as its factorization.

91443251 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4320, while the sum is 29.

The square root of 91443251 is about 9562.5964570299. The cubic root of 91443251 is about 450.5232612733.

The spelling of 91443251 in words is "ninety-one million, four hundred forty-three thousand, two hundred fifty-one".