31100111213 has 2 divisors, whose sum is σ = 31100111214. Its totient is φ = 31100111212.

The previous prime is 31100111201. The next prime is 31100111269. The reversal of 31100111213 is 31211100113.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 28327246249 + 2772864964 = 168307^2 + 52658^2 .

It is a cyclic number.

It is not a de Polignac number, because 31100111213 - 2⁴ = 31100111197 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31100111293) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15550055606 + 15550055607.

It is an arithmetic number, because the mean of its divisors is an integer number (15550055607).

Almost surely, 2^31100111213 is an apocalyptic number.

It is an amenable number.

31100111213 is a deficient number, since it is larger than the sum of its proper divisors (1).

31100111213 is an equidigital number, since it uses as much as digits as its factorization.

31100111213 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18, while the sum is 14.

Adding to 31100111213 its reverse (31211100113), we get a palindrome (62311211326).

The spelling of 31100111213 in words is "thirty-one billion, one hundred million, one hundred eleven thousand, two hundred thirteen".