31020201217 has 2 divisors, whose sum is σ = 31020201218. Its totient is φ = 31020201216.

The previous prime is 31020201169. The next prime is 31020201227. The reversal of 31020201217 is 71210202013.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 29496001536 + 1524199681 = 171744^2 + 39041^2 .

It is an emirp because it is prime and its reverse (71210202013) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31020201217 - 2¹⁹ = 31019676929 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31020201194 and 31020201203.

It is not a weakly prime, because it can be changed into another prime (31020201227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15510100608 + 15510100609.

It is an arithmetic number, because the mean of its divisors is an integer number (15510100609).

Almost surely, 2^31020201217 is an apocalyptic number.

It is an amenable number.

31020201217 is a deficient number, since it is larger than the sum of its proper divisors (1).

31020201217 is an equidigital number, since it uses as much as digits as its factorization.

31020201217 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 168, while the sum is 19.

The spelling of 31020201217 in words is "thirty-one billion, twenty million, two hundred one thousand, two hundred seventeen".