81233943 has 8 divisors (see below), whose sum is σ = 123785088. Its totient is φ = 46419384.

The previous prime is 81233941. The next prime is 81233969. The reversal of 81233943 is 34933218.

It is a happy number.

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

It is not a de Polignac number, because 81233943 - 2¹ = 81233941 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81233941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1934121 + ... + 1934162.

It is an arithmetic number, because the mean of its divisors is an integer number (15473136).

Almost surely, 2^81233943 is an apocalyptic number.

81233943 is a deficient number, since it is larger than the sum of its proper divisors (42551145).

81233943 is a wasteful number, since it uses less digits than its factorization.

81233943 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3868293.

The product of its digits is 15552, while the sum is 33.

The square root of 81233943 is about 9012.9874625454. The cubic root of 81233943 is about 433.0910190957.

The spelling of 81233943 in words is "eighty-one million, two hundred thirty-three thousand, nine hundred forty-three".