81133358 has 16 divisors (see below), whose sum is σ = 126409680. Its totient is φ = 39008256.

The previous prime is 81133321. The next prime is 81133391. The reversal of 81133358 is 85333118.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12185 + ... + 17627.

It is an arithmetic number, because the mean of its divisors is an integer number (7900605).

Almost surely, 2^81133358 is an apocalyptic number.

81133358 is a deficient number, since it is larger than the sum of its proper divisors (45276322).

81133358 is a wasteful number, since it uses less digits than its factorization.

81133358 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5731.

The product of its digits is 8640, while the sum is 32.

The square root of 81133358 is about 9007.4057308417. The cubic root of 81133358 is about 432.9121921555.

The spelling of 81133358 in words is "eighty-one million, one hundred thirty-three thousand, three hundred fifty-eight".