20131031113 has 2 divisors, whose sum is σ = 20131031114. Its totient is φ = 20131031112.

The previous prime is 20131031099. The next prime is 20131031147. The reversal of 20131031113 is 31113013102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11332028304 + 8799002809 = 106452^2 + 93803^2 .

It is a cyclic number.

It is not a de Polignac number, because 20131031113 - 2³³ = 11541096521 is a prime.

It is not a weakly prime, because it can be changed into another prime (20131031213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10065515556 + 10065515557.

It is an arithmetic number, because the mean of its divisors is an integer number (10065515557).

Almost surely, 2^20131031113 is an apocalyptic number.

It is an amenable number.

20131031113 is a deficient number, since it is larger than the sum of its proper divisors (1).

20131031113 is an equidigital number, since it uses as much as digits as its factorization.

20131031113 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 54, while the sum is 16.

Adding to 20131031113 its reverse (31113013102), we get a palindrome (51244044215).

The spelling of 20131031113 in words is "twenty billion, one hundred thirty-one million, thirty-one thousand, one hundred thirteen".