81243083 has 4 divisors (see below), whose sum is σ = 83438880. Its totient is φ = 79047288.

The previous prime is 81243079. The next prime is 81243091. The reversal of 81243083 is 38034218.

It is a happy number.

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 81243083 - 2² = 81243079 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81243013) 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 3 ways as a sum of consecutive naturals, for example, 1097843 + ... + 1097916.

It is an arithmetic number, because the mean of its divisors is an integer number (20859720).

Almost surely, 2^81243083 is an apocalyptic number.

81243083 is a deficient number, since it is larger than the sum of its proper divisors (2195797).

81243083 is a wasteful number, since it uses less digits than its factorization.

81243083 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2195796.

The product of its (nonzero) digits is 4608, while the sum is 29.

The square root of 81243083 is about 9013.4944943679. The cubic root of 81243083 is about 433.1072614993.

The spelling of 81243083 in words is "eighty-one million, two hundred forty-three thousand, eighty-three".