81243183 has 16 divisors (see below), whose sum is σ = 130315520. Its totient is φ = 43981056.

The previous prime is 81243179. The next prime is 81243191. The reversal of 81243183 is 38134218.

It is not a de Polignac number, because 81243183 - 2² = 81243179 is a prime.

It is the 9014-th Hogben number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 81243183.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81243103) by changing a digit.

It is a nontrivial repunit in base 9013.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 101410 + ... + 102207.

It is an arithmetic number, because the mean of its divisors is an integer number (8144720).

Almost surely, 2^81243183 is an apocalyptic number.

81243183 is a deficient number, since it is larger than the sum of its proper divisors (49072337).

81243183 is a wasteful number, since it uses less digits than its factorization.

81243183 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 203646.

The product of its digits is 4608, while the sum is 30.

The square root of 81243183 is about 9013.5000416043. The cubic root of 81243183 is about 433.1074391994.

The spelling of 81243183 in words is "eighty-one million, two hundred forty-three thousand, one hundred eighty-three".