31023020201209 has 2 divisors, whose sum is σ = 31023020201210. Its totient is φ = 31023020201208.

The previous prime is 31023020201191. The next prime is 31023020201227. The reversal of 31023020201209 is 90210202032013.

It is a balanced prime because it is at equal distance from previous prime (31023020201191) and next prime (31023020201227).

It can be written as a sum of positive squares in only one way, i.e., 28673850911209 + 2349169290000 = 5354797^2 + 1532700^2 .

It is a cyclic number.

It is not a de Polignac number, because 31023020201209 - 2¹⁷ = 31023020070137 is a prime.

It is not a weakly prime, because it can be changed into another prime (31023020208209) 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, 15511510100604 + 15511510100605.

It is an arithmetic number, because the mean of its divisors is an integer number (15511510100605).

Almost surely, 2^{31023020201209} is an apocalyptic number.

It is an amenable number.

31023020201209 is a deficient number, since it is larger than the sum of its proper divisors (1).

31023020201209 is an equidigital number, since it uses as much as digits as its factorization.

31023020201209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1296, while the sum is 25.

The spelling of 31023020201209 in words is "thirty-one trillion, twenty-three billion, twenty million, two hundred one thousand, two hundred nine".