91993143 has 16 divisors (see below), whose sum is σ = 135063936. Its totient is φ = 55230240.

The previous prime is 91993141. The next prime is 91993157. The reversal of 91993143 is 34139919.

It is not a de Polignac number, because 91993143 - 2¹ = 91993141 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91993141) 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 in 15 ways as a sum of consecutive naturals, for example, 9496 + ... + 16557.

It is an arithmetic number, because the mean of its divisors is an integer number (8441496).

Almost surely, 2^91993143 is an apocalyptic number.

91993143 is a deficient number, since it is larger than the sum of its proper divisors (43070793).

91993143 is a wasteful number, since it uses less digits than its factorization.

91993143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26174.

The product of its digits is 26244, while the sum is 39.

The square root of 91993143 is about 9591.3055941306. The cubic root of 91993143 is about 451.4245277075.

The spelling of 91993143 in words is "ninety-one million, nine hundred ninety-three thousand, one hundred forty-three".