81268907 has 2 divisors, whose sum is σ = 81268908. Its totient is φ = 81268906.

The previous prime is 81268883. The next prime is 81268919. The reversal of 81268907 is 70986218.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 81268907 - 2⁸ = 81268651 is a prime.

It is not a weakly prime, because it can be changed into another prime (81268927) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40634453 + 40634454.

It is an arithmetic number, because the mean of its divisors is an integer number (40634454).

Almost surely, 2^81268907 is an apocalyptic number.

81268907 is a deficient number, since it is larger than the sum of its proper divisors (1).

81268907 is an equidigital number, since it uses as much as digits as its factorization.

81268907 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48384, while the sum is 41.

The square root of 81268907 is about 9014.9268993154. The cubic root of 81268907 is about 433.1531459269.

The spelling of 81268907 in words is "eighty-one million, two hundred sixty-eight thousand, nine hundred seven".