81533283 has 8 divisors (see below), whose sum is σ = 117073488. Its totient is φ = 50174304.

The previous prime is 81533281. The next prime is 81533299. The reversal of 81533283 is 38233518.

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

It is not a de Polignac number, because 81533283 - 2¹ = 81533281 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81533281) 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, 1045260 + ... + 1045337.

It is an arithmetic number, because the mean of its divisors is an integer number (14634186).

Almost surely, 2^81533283 is an apocalyptic number.

81533283 is a deficient number, since it is larger than the sum of its proper divisors (35540205).

81533283 is a wasteful number, since it uses less digits than its factorization.

81533283 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2090613.

The product of its digits is 17280, while the sum is 33.

The square root of 81533283 is about 9029.5782293527. The cubic root of 81533283 is about 433.6223345652.

The spelling of 81533283 in words is "eighty-one million, five hundred thirty-three thousand, two hundred eighty-three".