81773353 has 2 divisors, whose sum is σ = 81773354. Its totient is φ = 81773352.

The previous prime is 81773347. The next prime is 81773357. The reversal of 81773353 is 35337718.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 74787904 + 6985449 = 8648^2 + 2643^2 .

It is a cyclic number.

It is not a de Polignac number, because 81773353 - 2⁹ = 81772841 is a prime.

It is not a weakly prime, because it can be changed into another prime (81773357) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40886676 + 40886677.

It is an arithmetic number, because the mean of its divisors is an integer number (40886677).

Almost surely, 2^81773353 is an apocalyptic number.

It is an amenable number.

81773353 is a deficient number, since it is larger than the sum of its proper divisors (1).

81773353 is an equidigital number, since it uses as much as digits as its factorization.

81773353 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 52920, while the sum is 37.

The square root of 81773353 is about 9042.8619916484. The cubic root of 81773353 is about 434.0475094344.

The spelling of 81773353 in words is "eighty-one million, seven hundred seventy-three thousand, three hundred fifty-three".