31203223213 has 2 divisors, whose sum is σ = 31203223214. Its totient is φ = 31203223212.

The previous prime is 31203223193. The next prime is 31203223241. The reversal of 31203223213 is 31232230213.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 23766230569 + 7436992644 = 154163^2 + 86238^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31203223213 is a prime.

It is a super-2 number, since 2×31203223213² (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 (31203223253) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15601611606 + 15601611607.

It is an arithmetic number, because the mean of its divisors is an integer number (15601611607).

Almost surely, 2^31203223213 is an apocalyptic number.

It is an amenable number.

31203223213 is a deficient number, since it is larger than the sum of its proper divisors (1).

31203223213 is an equidigital number, since it uses as much as digits as its factorization.

31203223213 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 31203223213 its reverse (31232230213), we get a palindrome (62435453426).

The spelling of 31203223213 in words is "thirty-one billion, two hundred three million, two hundred twenty-three thousand, two hundred thirteen".