81282307 has 2 divisors, whose sum is σ = 81282308. Its totient is φ = 81282306.

The previous prime is 81282277. The next prime is 81282319. The reversal of 81282307 is 70328218.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 81282307 - 2¹⁹ = 80758019 is a prime.

It is not a weakly prime, because it can be changed into another prime (81282367) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40641153 + 40641154.

It is an arithmetic number, because the mean of its divisors is an integer number (40641154).

Almost surely, 2^81282307 is an apocalyptic number.

81282307 is a deficient number, since it is larger than the sum of its proper divisors (1).

81282307 is an equidigital number, since it uses as much as digits as its factorization.

81282307 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5376, while the sum is 31.

The square root of 81282307 is about 9015.6700804765. The cubic root of 81282307 is about 433.1769513953.

The spelling of 81282307 in words is "eighty-one million, two hundred eighty-two thousand, three hundred seven".