81042107 has 2 divisors, whose sum is σ = 81042108. Its totient is φ = 81042106.

The previous prime is 81042103. The next prime is 81042119. The reversal of 81042107 is 70124018.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 81042107 - 2² = 81042103 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (81042103) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40521053 + 40521054.

It is an arithmetic number, because the mean of its divisors is an integer number (40521054).

Almost surely, 2^81042107 is an apocalyptic number.

81042107 is a deficient number, since it is larger than the sum of its proper divisors (1).

81042107 is an equidigital number, since it uses as much as digits as its factorization.

81042107 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 448, while the sum is 23.

The square root of 81042107 is about 9002.3389738445. The cubic root of 81042107 is about 432.7498319350.

The spelling of 81042107 in words is "eighty-one million, forty-two thousand, one hundred seven".