31231230113 has 2 divisors, whose sum is σ = 31231230114. Its totient is φ = 31231230112.

The previous prime is 31231230103. The next prime is 31231230131. The reversal of 31231230113 is 31103213213.

Together with next prime (31231230131) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 30242253409 + 988976704 = 173903^2 + 31448^2 .

It is a cyclic number.

It is not a de Polignac number, because 31231230113 - 2¹⁸ = 31230967969 is a prime.

It is not a weakly prime, because it can be changed into another prime (31231230103) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15615615056 + 15615615057.

It is an arithmetic number, because the mean of its divisors is an integer number (15615615057).

Almost surely, 2^31231230113 is an apocalyptic number.

It is an amenable number.

31231230113 is a deficient number, since it is larger than the sum of its proper divisors (1).

31231230113 is an equidigital number, since it uses as much as digits as its factorization.

31231230113 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 324, while the sum is 20.

Adding to 31231230113 its reverse (31103213213), we get a palindrome (62334443326).

The spelling of 31231230113 in words is "thirty-one billion, two hundred thirty-one million, two hundred thirty thousand, one hundred thirteen".