31310434121 has 2 divisors, whose sum is σ = 31310434122. Its totient is φ = 31310434120.

The previous prime is 31310434081. The next prime is 31310434123. The reversal of 31310434121 is 12143401313.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 30436640521 + 873793600 = 174461^2 + 29560^2 .

It is a cyclic number.

It is not a de Polignac number, because 31310434121 - 2²² = 31306239817 is a prime.

It is a Sophie Germain prime.

Together with 31310434123, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (31310434123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15655217060 + 15655217061.

It is an arithmetic number, because the mean of its divisors is an integer number (15655217061).

Almost surely, 2^31310434121 is an apocalyptic number.

It is an amenable number.

31310434121 is a deficient number, since it is larger than the sum of its proper divisors (1).

31310434121 is an equidigital number, since it uses as much as digits as its factorization.

31310434121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 864, while the sum is 23.

Adding to 31310434121 its reverse (12143401313), we get a palindrome (43453835434).

The spelling of 31310434121 in words is "thirty-one billion, three hundred ten million, four hundred thirty-four thousand, one hundred twenty-one".