81243043 has 8 divisors (see below), whose sum is σ = 93581312. Its totient is φ = 69087816.

The previous prime is 81243023. The next prime is 81243077. The reversal of 81243043 is 34034218.

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

It is not a de Polignac number, because 81243043 - 2¹³ = 81234851 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 81242999 and 81243017.

It is not an unprimeable number, because it can be changed into a prime (81243013) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 44805 + ... + 46582.

It is an arithmetic number, because the mean of its divisors is an integer number (11697664).

Almost surely, 2^81243043 is an apocalyptic number.

81243043 is a deficient number, since it is larger than the sum of its proper divisors (12338269).

81243043 is a wasteful number, since it uses less digits than its factorization.

81243043 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91521.

The product of its (nonzero) digits is 2304, while the sum is 25.

The square root of 81243043 is about 9013.4922754724. The cubic root of 81243043 is about 433.1071904192.

The spelling of 81243043 in words is "eighty-one million, two hundred forty-three thousand, forty-three".