91289543 has 2 divisors, whose sum is σ = 91289544. Its totient is φ = 91289542.

The previous prime is 91289533. The next prime is 91289573. The reversal of 91289543 is 34598219.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 91289543 - 2¹⁴ = 91273159 is a prime.

It is a super-2 number, since 2×91289543² = 16667561322297698, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 91289543.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91289533) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45644771 + 45644772.

It is an arithmetic number, because the mean of its divisors is an integer number (45644772).

Almost surely, 2^91289543 is an apocalyptic number.

91289543 is a deficient number, since it is larger than the sum of its proper divisors (1).

91289543 is an equidigital number, since it uses as much as digits as its factorization.

91289543 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 77760, while the sum is 41.

The square root of 91289543 is about 9554.5561383039. The cubic root of 91289543 is about 450.2706898134.

The spelling of 91289543 in words is "ninety-one million, two hundred eighty-nine thousand, five hundred forty-three".