81453233 has 2 divisors, whose sum is σ = 81453234. Its totient is φ = 81453232.

The previous prime is 81453227. The next prime is 81453269. The reversal of 81453233 is 33235418.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 81126049 + 327184 = 9007^2 + 572^2 .

It is a cyclic number.

It is not a de Polignac number, because 81453233 - 2⁸ = 81452977 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 81453196 and 81453205.

It is not a weakly prime, because it can be changed into another prime (81453283) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40726616 + 40726617.

It is an arithmetic number, because the mean of its divisors is an integer number (40726617).

Almost surely, 2^81453233 is an apocalyptic number.

It is an amenable number.

81453233 is a deficient number, since it is larger than the sum of its proper divisors (1).

81453233 is an equidigital number, since it uses as much as digits as its factorization.

81453233 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8640, while the sum is 29.

The square root of 81453233 is about 9025.1444863780. The cubic root of 81453233 is about 433.4803768566.

The spelling of 81453233 in words is "eighty-one million, four hundred fifty-three thousand, two hundred thirty-three".