81143546 has 8 divisors (see below), whose sum is σ = 132780384. Its totient is φ = 36883420.

The previous prime is 81143459. The next prime is 81143611. The reversal of 81143546 is 64534118.

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1844150 + ... + 1844193.

It is an arithmetic number, because the mean of its divisors is an integer number (16597548).

Almost surely, 2^81143546 is an apocalyptic number.

81143546 is a deficient number, since it is larger than the sum of its proper divisors (51636838).

81143546 is a wasteful number, since it uses less digits than its factorization.

81143546 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3688356.

The product of its digits is 11520, while the sum is 32.

The square root of 81143546 is about 9007.9712477339. The cubic root of 81143546 is about 432.9303118082.

The spelling of 81143546 in words is "eighty-one million, one hundred forty-three thousand, five hundred forty-six".