91273143 has 8 divisors (see below), whose sum is σ = 131058928. Its totient is φ = 56168064.

The previous prime is 91273139. The next prime is 91273159. The reversal of 91273143 is 34137219.

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

It is not a de Polignac number, because 91273143 - 2² = 91273139 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 91273143.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91273103) 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 7 ways as a sum of consecutive naturals, for example, 1170130 + ... + 1170207.

It is an arithmetic number, because the mean of its divisors is an integer number (16382366).

Almost surely, 2^91273143 is an apocalyptic number.

91273143 is a deficient number, since it is larger than the sum of its proper divisors (39785785).

91273143 is a wasteful number, since it uses less digits than its factorization.

91273143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2340353.

The product of its digits is 4536, while the sum is 30.

The square root of 91273143 is about 9553.6978704583. The cubic root of 91273143 is about 450.2437247624.

The spelling of 91273143 in words is "ninety-one million, two hundred seventy-three thousand, one hundred forty-three".