81133356 has 24 divisors (see below), whose sum is σ = 189924784. Its totient is φ = 26956800.

The previous prime is 81133321. The next prime is 81133391. The reversal of 81133356 is 65333118.

It is an interprime number because it is at equal distance from previous prime (81133321) and next prime (81133391).

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 7045 + ... + 14556.

Almost surely, 2^81133356 is an apocalyptic number.

It is an amenable number.

81133356 is an abundant number, since it is smaller than the sum of its proper divisors (108791428).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81133356 is a wasteful number, since it uses less digits than its factorization.

81133356 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21921 (or 21919 counting only the distinct ones).

The product of its digits is 6480, while the sum is 30.

The square root of 81133356 is about 9007.4056198219. The cubic root of 81133356 is about 432.9121885983.

The spelling of 81133356 in words is "eighty-one million, one hundred thirty-three thousand, three hundred fifty-six".