20131023109 has 2 divisors, whose sum is σ = 20131023110. Its totient is φ = 20131023108.

The previous prime is 20131023103. The next prime is 20131023113. The reversal of 20131023109 is 90132013102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13850936100 + 6280087009 = 117690^2 + 79247^2 .

It is a cyclic number.

It is not a de Polignac number, because 20131023109 - 2⁷ = 20131022981 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20131023109.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20131023103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10065511554 + 10065511555.

It is an arithmetic number, because the mean of its divisors is an integer number (10065511555).

Almost surely, 2^20131023109 is an apocalyptic number.

It is an amenable number.

20131023109 is a deficient number, since it is larger than the sum of its proper divisors (1).

20131023109 is an equidigital number, since it uses as much as digits as its factorization.

20131023109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 324, while the sum is 22.

The spelling of 20131023109 in words is "twenty billion, one hundred thirty-one million, twenty-three thousand, one hundred nine".