81125043 has 8 divisors (see below), whose sum is σ = 108213456. Its totient is φ = 54060000.

The previous prime is 81125027. The next prime is 81125081. The reversal of 81125043 is 34052118.

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

It is not a de Polignac number, because 81125043 - 2⁴ = 81125027 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81121043) 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 7 ways as a sum of consecutive naturals, for example, 5293 + ... + 13793.

It is an arithmetic number, because the mean of its divisors is an integer number (13526682).

Almost surely, 2^81125043 is an apocalyptic number.

81125043 is a deficient number, since it is larger than the sum of its proper divisors (27088413).

81125043 is a wasteful number, since it uses less digits than its factorization.

81125043 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11685.

The product of its (nonzero) digits is 960, while the sum is 24.

The square root of 81125043 is about 9006.9441543733. The cubic root of 81125043 is about 432.8974025632.

It can be divided in two parts, 8112 and 5043, that multiplied together give a square (40908816 = 6396²).

The spelling of 81125043 in words is "eighty-one million, one hundred twenty-five thousand, forty-three".