31213203312149 has 2 divisors, whose sum is σ = 31213203312150. Its totient is φ = 31213203312148.

The previous prime is 31213203312077. The next prime is 31213203312157. The reversal of 31213203312149 is 94121330231213.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15624683179249 + 15588520132900 = 3952807^2 + 3948230^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31213203312149 is a prime.

It is a super-2 number, since 2×31213203312149² (a number of 28 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31213203312199) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15606601656074 + 15606601656075.

It is an arithmetic number, because the mean of its divisors is an integer number (15606601656075).

Almost surely, 2^{31213203312149} is an apocalyptic number.

It is an amenable number.

31213203312149 is a deficient number, since it is larger than the sum of its proper divisors (1).

31213203312149 is an equidigital number, since it uses as much as digits as its factorization.

31213203312149 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 23328, while the sum is 35.

The spelling of 31213203312149 in words is "thirty-one trillion, two hundred thirteen billion, two hundred three million, three hundred twelve thousand, one hundred forty-nine".