81232133 has 2 divisors, whose sum is σ = 81232134. Its totient is φ = 81232132.

The previous prime is 81232127. The next prime is 81232157. The reversal of 81232133 is 33123218.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 41705764 + 39526369 = 6458^2 + 6287^2 .

It is a cyclic number.

It is not a de Polignac number, because 81232133 - 2²⁴ = 64454917 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 81232099 and 81232108.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81232033) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40616066 + 40616067.

It is an arithmetic number, because the mean of its divisors is an integer number (40616067).

Almost surely, 2^81232133 is an apocalyptic number.

It is an amenable number.

81232133 is a deficient number, since it is larger than the sum of its proper divisors (1).

81232133 is an equidigital number, since it uses as much as digits as its factorization.

81232133 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 864, while the sum is 23.

The square root of 81232133 is about 9012.8870513282. The cubic root of 81232133 is about 433.0878024577.

The spelling of 81232133 in words is "eighty-one million, two hundred thirty-two thousand, one hundred thirty-three".