81003229 has 2 divisors, whose sum is σ = 81003230. Its totient is φ = 81003228.

The previous prime is 81003187. The next prime is 81003277. The reversal of 81003229 is 92230018.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 41602500 + 39400729 = 6450^2 + 6277^2 .

It is a cyclic number.

It is not a de Polignac number, because 81003229 - 2⁹ = 81002717 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81003029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40501614 + 40501615.

It is an arithmetic number, because the mean of its divisors is an integer number (40501615).

Almost surely, 2^81003229 is an apocalyptic number.

It is an amenable number.

81003229 is a deficient number, since it is larger than the sum of its proper divisors (1).

81003229 is an equidigital number, since it uses as much as digits as its factorization.

81003229 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 81003229 is about 9000.1793871011. The cubic root of 81003229 is about 432.6806204280.

The spelling of 81003229 in words is "eighty-one million, three thousand, two hundred twenty-nine".