81303029 has 2 divisors, whose sum is σ = 81303030. Its totient is φ = 81303028.

The previous prime is 81302971. The next prime is 81303043. The reversal of 81303029 is 92030318.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 48790225 + 32512804 = 6985^2 + 5702^2 .

It is a cyclic number.

It is not a de Polignac number, because 81303029 - 2¹⁶ = 81237493 is a prime.

It is a super-2 number, since 2×81303029² = 13220365049149682, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 81302989 and 81303007.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81303059) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40651514 + 40651515.

It is an arithmetic number, because the mean of its divisors is an integer number (40651515).

Almost surely, 2^81303029 is an apocalyptic number.

It is an amenable number.

81303029 is a deficient number, since it is larger than the sum of its proper divisors (1).

81303029 is an equidigital number, since it uses as much as digits as its factorization.

81303029 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1296, while the sum is 26.

The square root of 81303029 is about 9016.8192285306. The cubic root of 81303029 is about 433.2137594470.

The spelling of 81303029 in words is "eighty-one million, three hundred three thousand, twenty-nine".