81443203 has 2 divisors, whose sum is σ = 81443204. Its totient is φ = 81443202.

The previous prime is 81443191. The next prime is 81443227. The reversal of 81443203 is 30234418.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81443203 is a prime.

It is not a weakly prime, because it can be changed into another prime (81413203) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40721601 + 40721602.

It is an arithmetic number, because the mean of its divisors is an integer number (40721602).

Almost surely, 2^81443203 is an apocalyptic number.

81443203 is a deficient number, since it is larger than the sum of its proper divisors (1).

81443203 is an equidigital number, since it uses as much as digits as its factorization.

81443203 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2304, while the sum is 25.

The square root of 81443203 is about 9024.5887994966. The cubic root of 81443203 is about 433.4625834698.

The spelling of 81443203 in words is "eighty-one million, four hundred forty-three thousand, two hundred three".