91197543 has 8 divisors (see below), whose sum is σ = 121801456. Its totient is φ = 60696000.

The previous prime is 91197529. The next prime is 91197551. The reversal of 91197543 is 34579119.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 91197543 - 2⁸ = 91197287 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91197523) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23488 + ... + 27093.

It is an arithmetic number, because the mean of its divisors is an integer number (15225182).

Almost surely, 2^91197543 is an apocalyptic number.

91197543 is a deficient number, since it is larger than the sum of its proper divisors (30603913).

91197543 is a wasteful number, since it uses less digits than its factorization.

91197543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51185.

The product of its digits is 34020, while the sum is 39.

The square root of 91197543 is about 9549.7404676776. The cubic root of 91197543 is about 450.1193806723.

The spelling of 91197543 in words is "ninety-one million, one hundred ninety-seven thousand, five hundred forty-three".