81038133 has 48 divisors (see below), whose sum is σ = 136468800. Its totient is φ = 45795840.

The previous prime is 81038107. The next prime is 81038143. The reversal of 81038133 is 33183018.

It is not a de Polignac number, because 81038133 - 2⁸ = 81037877 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 81038097 and 81038106.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81038143) 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 47 ways as a sum of consecutive naturals, for example, 301123 + ... + 301391.

It is an arithmetic number, because the mean of its divisors is an integer number (2843100).

Almost surely, 2^81038133 is an apocalyptic number.

It is an amenable number.

81038133 is a deficient number, since it is larger than the sum of its proper divisors (55430667).

81038133 is a wasteful number, since it uses less digits than its factorization.

81038133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 482 (or 479 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 81038133 is about 9002.1182507230. The cubic root of 81038133 is about 432.7427583448.

The spelling of 81038133 in words is "eighty-one million, thirty-eight thousand, one hundred thirty-three".