81224383 has 2 divisors, whose sum is σ = 81224384. Its totient is φ = 81224382.

The previous prime is 81224369. The next prime is 81224387. The reversal of 81224383 is 38342218.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81224383 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81224387) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40612191 + 40612192.

It is an arithmetic number, because the mean of its divisors is an integer number (40612192).

Almost surely, 2^81224383 is an apocalyptic number.

81224383 is a deficient number, since it is larger than the sum of its proper divisors (1).

81224383 is an equidigital number, since it uses as much as digits as its factorization.

81224383 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9216, while the sum is 31.

The square root of 81224383 is about 9012.4571011462. The cubic root of 81224383 is about 433.0740290198.

The spelling of 81224383 in words is "eighty-one million, two hundred twenty-four thousand, three hundred eighty-three".