20130123101989 has 2 divisors, whose sum is σ = 20130123101990. Its totient is φ = 20130123101988.

The previous prime is 20130123101983. The next prime is 20130123102091. The reversal of 20130123101989 is 98910132103102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16216286033025 + 3913837068964 = 4026945^2 + 1978342^2 .

It is a cyclic number.

It is not a de Polignac number, because 20130123101989 - 2¹¹ = 20130123099941 is a prime.

It is a super-2 number, since 2×20130123101989² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20130123101983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10065061550994 + 10065061550995.

It is an arithmetic number, because the mean of its divisors is an integer number (10065061550995).

Almost surely, 2^{20130123101989} is an apocalyptic number.

It is an amenable number.

20130123101989 is a deficient number, since it is larger than the sum of its proper divisors (1).

20130123101989 is an equidigital number, since it uses as much as digits as its factorization.

20130123101989 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 23328, while the sum is 40.

The spelling of 20130123101989 in words is "twenty trillion, one hundred thirty billion, one hundred twenty-three million, one hundred one thousand, nine hundred eighty-nine".