81133324 has 12 divisors (see below), whose sum is σ = 146563648. Its totient is φ = 39258000.

The previous prime is 81133321. The next prime is 81133391. The reversal of 81133324 is 42333118.

It is a hoax number, since the sum of its digits (25) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (81133321) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 327027 + ... + 327274.

Almost surely, 2^81133324 is an apocalyptic number.

It is an amenable number.

81133324 is a deficient number, since it is larger than the sum of its proper divisors (65430324).

81133324 is a wasteful number, since it uses less digits than its factorization.

81133324 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 654336 (or 654334 counting only the distinct ones).

The product of its digits is 1728, while the sum is 25.

The square root of 81133324 is about 9007.4038435056. The cubic root of 81133324 is about 432.9121316829.

The spelling of 81133324 in words is "eighty-one million, one hundred thirty-three thousand, three hundred twenty-four".