81101833 has 2 divisors, whose sum is σ = 81101834. Its totient is φ = 81101832.

The previous prime is 81101821. The next prime is 81101843. The reversal of 81101833 is 33810118.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 63234304 + 17867529 = 7952^2 + 4227^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81101833 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 81101798 and 81101807.

It is not a weakly prime, because it can be changed into another prime (81101803) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40550916 + 40550917.

It is an arithmetic number, because the mean of its divisors is an integer number (40550917).

Almost surely, 2^81101833 is an apocalyptic number.

It is an amenable number.

81101833 is a deficient number, since it is larger than the sum of its proper divisors (1).

81101833 is an equidigital number, since it uses as much as digits as its factorization.

81101833 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 576, while the sum is 25.

The square root of 81101833 is about 9005.6556118919. The cubic root of 81101833 is about 432.8561144204.

The spelling of 81101833 in words is "eighty-one million, one hundred one thousand, eight hundred thirty-three".