20131111030981 has 2 divisors, whose sum is σ = 20131111030982. Its totient is φ = 20131111030980.

The previous prime is 20131111030939. The next prime is 20131111031027. The reversal of 20131111030981 is 18903011113102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14211889657956 + 5919221373025 = 3769866^2 + 2432945^2 .

It is a cyclic number.

It is not a de Polignac number, because 20131111030981 - 2²³ = 20131102642373 is a prime.

It is a super-2 number, since 2×20131111030981² (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 (20131111033981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10065555515490 + 10065555515491.

It is an arithmetic number, because the mean of its divisors is an integer number (10065555515491).

Almost surely, 2^{20131111030981} is an apocalyptic number.

It is an amenable number.

20131111030981 is a deficient number, since it is larger than the sum of its proper divisors (1).

20131111030981 is an equidigital number, since it uses as much as digits as its factorization.

20131111030981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1296, while the sum is 31.

The spelling of 20131111030981 in words is "twenty trillion, one hundred thirty-one billion, one hundred eleven million, thirty thousand, nine hundred eighty-one".