31606532213 has 2 divisors, whose sum is σ = 31606532214. Its totient is φ = 31606532212.

The previous prime is 31606532197. The next prime is 31606532227. The reversal of 31606532213 is 31223560613.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22868395729 + 8738136484 = 151223^2 + 93478^2 .

It is a cyclic number.

It is not a de Polignac number, because 31606532213 - 2⁴ = 31606532197 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 31606532213.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31606537213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15803266106 + 15803266107.

It is an arithmetic number, because the mean of its divisors is an integer number (15803266107).

Almost surely, 2^31606532213 is an apocalyptic number.

It is an amenable number.

31606532213 is a deficient number, since it is larger than the sum of its proper divisors (1).

31606532213 is an equidigital number, since it uses as much as digits as its factorization.

31606532213 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 19440, while the sum is 32.

The spelling of 31606532213 in words is "thirty-one billion, six hundred six million, five hundred thirty-two thousand, two hundred thirteen".