31231120312313 has 2 divisors, whose sum is σ = 31231120312314. Its totient is φ = 31231120312312.

The previous prime is 31231120312303. The next prime is 31231120312319. The reversal of 31231120312313 is 31321302113213.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20835828778384 + 10395291533929 = 4564628^2 + 3224173^2 .

It is a cyclic number.

It is not a de Polignac number, because 31231120312313 - 2⁸ = 31231120312057 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (31231120312319) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15615560156156 + 15615560156157.

It is an arithmetic number, because the mean of its divisors is an integer number (15615560156157).

Almost surely, 2^{31231120312313} is an apocalyptic number.

It is an amenable number.

31231120312313 is a deficient number, since it is larger than the sum of its proper divisors (1).

31231120312313 is an equidigital number, since it uses as much as digits as its factorization.

31231120312313 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1944, while the sum is 26.

Adding to 31231120312313 its reverse (31321302113213), we get a palindrome (62552422425526).

The spelling of 31231120312313 in words is "thirty-one trillion, two hundred thirty-one billion, one hundred twenty million, three hundred twelve thousand, three hundred thirteen".