81484533 has 30 divisors (see below), whose sum is σ = 127910094. Its totient is φ = 49986144.

The previous prime is 81484463. The next prime is 81484537. The reversal of 81484533 is 33548418.

81484533 is a `hidden beast` number, since 81 + 48 + 4 + 533 = 666.

It can be written as a sum of positive squares in 5 ways, for example, as 80245764 + 1238769 = 8958^2 + 1113^2 .

It is not a de Polignac number, because 81484533 - 2²¹ = 79387381 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81484537) 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 29 ways as a sum of consecutive naturals, for example, 256891 + ... + 257207.

Almost surely, 2^81484533 is an apocalyptic number.

It is an amenable number.

81484533 is a deficient number, since it is larger than the sum of its proper divisors (46425561).

81484533 is an equidigital number, since it uses as much as digits as its factorization.

81484533 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 375 (or 333 counting only the distinct ones).

The product of its digits is 46080, while the sum is 36.

The square root of 81484533 is about 9026.8783640858. The cubic root of 81484533 is about 433.5358941874.

The spelling of 81484533 in words is "eighty-one million, four hundred eighty-four thousand, five hundred thirty-three".