81341133 has 32 divisors (see below), whose sum is σ = 117553152. Its totient is φ = 49896000.

The previous prime is 81341131. The next prime is 81341153. The reversal of 81341133 is 33114318.

It is not a de Polignac number, because 81341133 - 2¹ = 81341131 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81341131) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 385398 + ... + 385608.

It is an arithmetic number, because the mean of its divisors is an integer number (3673536).

Almost surely, 2^81341133 is an apocalyptic number.

It is an amenable number.

81341133 is a deficient number, since it is larger than the sum of its proper divisors (36212019).

81341133 is a wasteful number, since it uses less digits than its factorization.

81341133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 425.

The product of its digits is 864, while the sum is 24.

The square root of 81341133 is about 9018.9319212421. The cubic root of 81341133 is about 433.2814264584.

The spelling of 81341133 in words is "eighty-one million, three hundred forty-one thousand, one hundred thirty-three".