91238543 has 4 divisors (see below), whose sum is σ = 99532968. Its totient is φ = 82944120.

The previous prime is 91238519. The next prime is 91238557. The reversal of 91238543 is 34583219.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 91238543 - 2¹⁰ = 91237519 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 (91238593) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4147196 + ... + 4147217.

It is an arithmetic number, because the mean of its divisors is an integer number (24883242).

Almost surely, 2^91238543 is an apocalyptic number.

91238543 is a deficient number, since it is larger than the sum of its proper divisors (8294425).

91238543 is a wasteful number, since it uses less digits than its factorization.

91238543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8294424.

The product of its digits is 25920, while the sum is 35.

The square root of 91238543 is about 9551.8868816585. The cubic root of 91238543 is about 450.1868244838.

The spelling of 91238543 in words is "ninety-one million, two hundred thirty-eight thousand, five hundred forty-three".