81529303 has 2 divisors, whose sum is σ = 81529304. Its totient is φ = 81529302.

The previous prime is 81529243. The next prime is 81529313. The reversal of 81529303 is 30392518.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 81529303 - 2¹⁷ = 81398231 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81529313) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40764651 + 40764652.

It is an arithmetic number, because the mean of its divisors is an integer number (40764652).

Almost surely, 2^81529303 is an apocalyptic number.

81529303 is a deficient number, since it is larger than the sum of its proper divisors (1).

81529303 is an equidigital number, since it uses as much as digits as its factorization.

81529303 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6480, while the sum is 31.

The square root of 81529303 is about 9029.3578398466. The cubic root of 81529303 is about 433.6152787760.

The spelling of 81529303 in words is "eighty-one million, five hundred twenty-nine thousand, three hundred three".