31202803213 has 2 divisors, whose sum is σ = 31202803214. Its totient is φ = 31202803212.

The previous prime is 31202803193. The next prime is 31202803267. The reversal of 31202803213 is 31230820213.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 23056296649 + 8146506564 = 151843^2 + 90258^2 .

It is an emirp because it is prime and its reverse (31230820213) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31202803213 is a prime.

It is a super-2 number, since 2×31202803213² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31202803613) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15601401606 + 15601401607.

It is an arithmetic number, because the mean of its divisors is an integer number (15601401607).

Almost surely, 2^31202803213 is an apocalyptic number.

It is an amenable number.

31202803213 is a deficient number, since it is larger than the sum of its proper divisors (1).

31202803213 is an equidigital number, since it uses as much as digits as its factorization.

31202803213 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1728, while the sum is 25.

The spelling of 31202803213 in words is "thirty-one billion, two hundred two million, eight hundred three thousand, two hundred thirteen".