91234543 has 4 divisors (see below), whose sum is σ = 91276560. Its totient is φ = 91192528.

The previous prime is 91234541. The next prime is 91234547. The reversal of 91234543 is 34543219.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 34543219 = 3343 ⋅10333.

It is a cyclic number.

It is not a de Polignac number, because 91234543 - 2¹ = 91234541 is a prime.

It is a super-3 number, since 3×91234543³ (a number of 25 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91234541) 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 in 3 ways as a sum of consecutive naturals, for example, 17563 + ... + 22156.

It is an arithmetic number, because the mean of its divisors is an integer number (22819140).

Almost surely, 2^91234543 is an apocalyptic number.

91234543 is a deficient number, since it is larger than the sum of its proper divisors (42017).

91234543 is a wasteful number, since it uses less digits than its factorization.

91234543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42016.

The product of its digits is 12960, while the sum is 31.

The square root of 91234543 is about 9551.6774966495. The cubic root of 91234543 is about 450.1802454893.

The spelling of 91234543 in words is "ninety-one million, two hundred thirty-four thousand, five hundred forty-three".