9865142123 has 2 divisors, whose sum is σ = 9865142124. Its totient is φ = 9865142122.

The previous prime is 9865142081. The next prime is 9865142239. The reversal of 9865142123 is 3212415689.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9865142123 is a prime.

It is not a weakly prime, because it can be changed into another prime (9865142423) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4932571061 + 4932571062.

It is an arithmetic number, because the mean of its divisors is an integer number (4932571062).

Almost surely, 2^9865142123 is an apocalyptic number.

9865142123 is a deficient number, since it is larger than the sum of its proper divisors (1).

9865142123 is an equidigital number, since it uses as much as digits as its factorization.

9865142123 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 103680, while the sum is 41.

The square root of 9865142123 is about 99323.4218248647. The cubic root of 9865142123 is about 2144.7060757908.

The spelling of 9865142123 in words is "nine billion, eight hundred sixty-five million, one hundred forty-two thousand, one hundred twenty-three".