1001012123 has 2 divisors, whose sum is σ = 1001012124. Its totient is φ = 1001012122.

The previous prime is 1001012107. The next prime is 1001012143. The reversal of 1001012123 is 3212101001.

It is a weak prime.

It is an emirp because it is prime and its reverse (3212101001) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1001012123 - 2⁴ = 1001012107 is a prime.

It is not a weakly prime, because it can be changed into another prime (1001012143) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 500506061 + 500506062.

It is an arithmetic number, because the mean of its divisors is an integer number (500506062).

Almost surely, 2^1001012123 is an apocalyptic number.

1001012123 is a deficient number, since it is larger than the sum of its proper divisors (1).

1001012123 is an equidigital number, since it uses as much as digits as its factorization.

1001012123 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12, while the sum is 11.

The square root of 1001012123 is about 31638.7756242241. The cubic root of 1001012123 is about 1000.3372605759.

Adding to 1001012123 its reverse (3212101001), we get a palindrome (4213113124).

The spelling of 1001012123 in words is "one billion, one million, twelve thousand, one hundred twenty-three".