31313122201 has 4 divisors (see below), whose sum is σ = 31313502900. Its totient is φ = 31312741504.

The previous prime is 31313122199. The next prime is 31313122207. The reversal of 31313122201 is 10222131313.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 10222131313 = 701 ⋅14582213.

It can be written as a sum of positive squares in 2 ways, for example, as 1652016025 + 29661106176 = 40645^2 + 172224^2 .

It is a cyclic number.

It is not a de Polignac number, because 31313122201 - 2¹ = 31313122199 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31313122207) 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 in 3 ways as a sum of consecutive naturals, for example, 10036 + ... + 250453.

It is an arithmetic number, because the mean of its divisors is an integer number (7828375725).

Almost surely, 2^31313122201 is an apocalyptic number.

It is an amenable number.

31313122201 is a deficient number, since it is larger than the sum of its proper divisors (380699).

31313122201 is a wasteful number, since it uses less digits than its factorization.

31313122201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 380698.

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 31313122201 its reverse (10222131313), we get a palindrome (41535253514).

The spelling of 31313122201 in words is "thirty-one billion, three hundred thirteen million, one hundred twenty-two thousand, two hundred one".