91816543 has 12 divisors (see below), whose sum is σ = 115023720. Its totient is φ = 72645552.

The previous prime is 91816537. The next prime is 91816559. The reversal of 91816543 is 34561819.

It is not a de Polignac number, because 91816543 - 2²¹ = 89719391 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91816243) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 71433 + ... + 72706.

It is an arithmetic number, because the mean of its divisors is an integer number (9585310).

Almost surely, 2^91816543 is an apocalyptic number.

91816543 is a deficient number, since it is larger than the sum of its proper divisors (23207177).

91816543 is a wasteful number, since it uses less digits than its factorization.

91816543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 144166 (or 144159 counting only the distinct ones).

The product of its digits is 25920, while the sum is 37.

The square root of 91816543 is about 9582.0949170836. The cubic root of 91816543 is about 451.1354748589.

The spelling of 91816543 in words is "ninety-one million, eight hundred sixteen thousand, five hundred forty-three".