81750943 has 8 divisors (see below), whose sum is σ = 87222960. Its totient is φ = 76352640.

The previous prime is 81750941. The next prime is 81750953. The reversal of 81750943 is 34905718.

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

It is a cyclic number.

It is not a de Polignac number, because 81750943 - 2¹ = 81750941 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 (81750941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16128 + ... + 20581.

It is an arithmetic number, because the mean of its divisors is an integer number (10902870).

Almost surely, 2^81750943 is an apocalyptic number.

81750943 is a deficient number, since it is larger than the sum of its proper divisors (5472017).

81750943 is a wasteful number, since it uses less digits than its factorization.

81750943 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36857.

The product of its (nonzero) digits is 30240, while the sum is 37.

The square root of 81750943 is about 9041.6228078813. The cubic root of 81750943 is about 434.0078555495.

The spelling of 81750943 in words is "eighty-one million, seven hundred fifty thousand, nine hundred forty-three".