31320232213 has 2 divisors, whose sum is σ = 31320232214. Its totient is φ = 31320232212.

The previous prime is 31320232189. The next prime is 31320232219. The reversal of 31320232213 is 31223202313.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19750648369 + 11569583844 = 140537^2 + 107562^2 .

It is an emirp because it is prime and its reverse (31223202313) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31320232213 - 2¹³ = 31320224021 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31320232219) 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, 15660116106 + 15660116107.

It is an arithmetic number, because the mean of its divisors is an integer number (15660116107).

Almost surely, 2^31320232213 is an apocalyptic number.

It is an amenable number.

31320232213 is a deficient number, since it is larger than the sum of its proper divisors (1).

31320232213 is an equidigital number, since it uses as much as digits as its factorization.

31320232213 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 22.

Adding to 31320232213 its reverse (31223202313), we get a palindrome (62543434526).

The spelling of 31320232213 in words is "thirty-one billion, three hundred twenty million, two hundred thirty-two thousand, two hundred thirteen".