31100332121 has 2 divisors, whose sum is σ = 31100332122. Its totient is φ = 31100332120.

The previous prime is 31100332099. The next prime is 31100332139. The reversal of 31100332121 is 12123300113.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25707632896 + 5392699225 = 160336^2 + 73435^2 .

It is a cyclic number.

It is not a de Polignac number, because 31100332121 - 2⁶ = 31100332057 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 31100332121.

It is not a weakly prime, because it can be changed into another prime (31100331121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15550166060 + 15550166061.

It is an arithmetic number, because the mean of its divisors is an integer number (15550166061).

Almost surely, 2^31100332121 is an apocalyptic number.

It is an amenable number.

31100332121 is a deficient number, since it is larger than the sum of its proper divisors (1).

31100332121 is an equidigital number, since it uses as much as digits as its factorization.

31100332121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 108, while the sum is 17.

Adding to 31100332121 its reverse (12123300113), we get a palindrome (43223632234).

The spelling of 31100332121 in words is "thirty-one billion, one hundred million, three hundred thirty-two thousand, one hundred twenty-one".